When cleaning the vegan leather steering wheel of a Model 3, the use of high-concentration alcohol or bleach is strictly prohibited to prevent the coating from peeling off.
It is recommended to prioritize the use of alcohol-free baby wipes or warm water with a small amount of non-foaming soap, gently wiping with a microfiber cloth.
If deep disinfection is absolutely necessary, it is limited to occasional use of an isopropyl alcohol solution with a concentration of less than 30%, quickly wiped over and immediately dried, ensuring the liquid does not stay for more than 10 seconds to avoid irreversible chemical damage.
Wipes
Common Clorox or Lysol disinfectant wipes on the market usually contain 0.1% to 0.5% quaternary ammonium compounds, and some contain bleach components.
The safest alternative for vegan leather is unscented pure water baby wipes with a purity of over 99% (such as the WaterWipes brand), whose pH value is in the weakly acidic to neutral range of 5.5 to 7.
After cleaning with wipes, it is necessary to use a dry microfiber cloth to completely dry the moisture.
Ingredients & Safety
Tesla has completely replaced the steering wheel of the Model 3 with artificial polyurethane leather since 2019. Many people have the habit of applying Purell hand sanitizer containing 70% alcohol before getting into the car.
After Purell hand sanitizer remains on the hands and grips the steering wheel, the alcohol will destroy the surface layer of the steering wheel just like nail polish remover dissolves nail polish. The destruction of the surface layer will cause the steering wheel to peel within 6 months.
The phenomenon of peeling is very common at a Tesla service center in Los Angeles, California. The center received 412 repair cases for damaged steering wheels in 2022.
In 68% of the 412 repair cases, the owners admitted to using Lysol or Clorox brand household disinfectant wipes weekly to wipe the interior. Household disinfectant wipes were originally meant to wipe kitchen marble or metal countertops.
Kitchen marble or metal countertops can withstand the high concentrations of quaternary ammonium salts and sodium hypochlorite in the wipes. When quaternary ammonium salts come into contact with the Model 3's polyurethane leather, a chemical reaction will be triggered, making the leather soft and sticky.
After the leather becomes soft and sticky, it acts like melted chewing gum in summer, absorbing all the dust from the hands. In order to figure out the destructive power of different components, an automotive materials testing agency in Miami conducted a comparative evaluation.
The comparative evaluation selected 250 polyurethane samples of the same material as the Model 3. Testers soaked the samples separately in the liquids of daily necessities for 24 hours to observe the surface changes.
| Daily Liquid | Active Ingredient | pH Value | Surface Damage Rate (250 Samples) |
|---|---|---|---|
| Clorox Kitchen Wipes | Sodium Hypochlorite (Bleach) | 10.5 | 82% (Hardened and discolored) |
| 75% Medical Alcohol Pads | Ethanol / Isopropyl Alcohol | 6.0 | 95% (Severe peeling) |
| Johnson's Baby Wipes | 99% Pure Water | 5.5 | 0% (No change) |
| Makeup Remover Pads | Mineral Oil | 5.0 | 12% (Discolored and sticky) |
The surface damage rates of 12% to 95% in the table clearly reflect the destructive power of chemical substances. The destructive power of chemical substances highlights the advantages of pure water baby wipes with a purity of over 99%.
The pure water baby wipes with a purity of over 99% only contain water and a tiny amount of grapefruit peel extract. The formula combining pure water and extract can maintain a weak acidity of 5.5 while cleaning hand sweat and fast food french fry grease.
Maintaining a weak acidity of 5.5 is identical to the pH level of human baby skin, and will not strip away the oils inside the polyurethane material. Once the oils inside the material are lost, the steering wheel will crack like dry lips in winter.
A steering wheel that cracks like dry lips in winter is expensive to repair. According to quotes from 30 auto interior shops in Brooklyn, New York, recovering a Model 3 steering wheel costs an average of 550 dollars.
Spending 550 dollars can be completely avoided by using cheap pure water wipes. A pack of 72 WaterWipes baby wipes on Amazon costs only 4 dollars.
After wiping the steering wheel with the 4-dollar pure water wipes, a thin mist of water will be left on the surface. If the water mist dries naturally, the calcium and magnesium ions in the tap water will clump in the pores of the leather.
The minerals clumped in the leather pores will become hard and stretch the pores under sun exposure. Using a microfiber towel with a thickness of over 300 GSM to completely dry the water mist within 30 seconds can solve the residue dirt.
The action of completely drying the water mist can take away the moisture and the dirt residue softened and lifted by the wipes. A Tesla owners group in Seattle once conducted a follow-up visit with 80 owners who are accustomed to drying their steering wheels.
Among the 80 owners revisited, 96% stated that after 4 years of driving, their steering wheels still presented a matte texture like new cars. A matte texture is a sign of healthy polyurethane leather.
The sign of health is easily destroyed by car interior wipes containing silicone oil. To make the interior look shiny, many owners buy Armor All cleaning wipes containing 20% silicone oil.
The silicone oil in Armor All cleaning wipes will coat the outer ring of the steering wheel with a slippery plastic film. When a driver grips this plastic film with sweaty palms, the chance of slipping during sharp turns will increase by 50%.
The 50% increase in the chance of slipping during sharp turns seriously affects driving safety. Choosing gentle wipes clearly labeled water-based and 0% silicone oil in the ingredient list is the correct approach.
Gentle wipes with 0% silicone oil usually use non-ionic surfactants. Non-ionic surfactants physically separate the hand sweat remaining on the steering wheel, just like dish soap strips steak grease from a dinner plate.
Physically separating the hand sweat remaining on the steering wheel does not require the participation of any strong acid or strong alkali. An auto detailing shop in Texas surveyed 120 vehicles using non-ionic water-based wipes long-term in 2023.
None of the 120 vehicles using non-ionic water-based wipes long-term experienced interior fading or hardening. The absence of interior fading or hardening verifies the importance of matching daily necessity ingredients with car interior cleaners.
Cleaning Process
Never perform the cleaning work immediately after getting in the car, especially when the car is parked outdoors in summer. According to actual measurement data from Phoenix, Arizona in 2023, direct sunlight can cause the surface temperature of the black steering wheel to soar to 158°F (about 70°C).
When the temperature soars to 158°F, the tiny pores on the synthetic leather surface will open up like a sponge. If you wipe directly with a wipe at this time, the speed at which the cleaning fluid penetrates into the material will be 3 times faster than usual.
If the cleaning fluid penetrates into the material and cannot get out, the steering wheel will bubble over time. Therefore, the first thing must be to turn on the air conditioning (AC) and lower the temperature inside the car to about 75°F (about 24°C) before starting.
After lowering the interior temperature to 75°F, pull out a WaterWipes pure water wipe from the package. For better handling, fold the wipe in half twice, folding it into a small square about 2 millimeters thick.
Folding it into a small square about 2 millimeters thick can cushion the force of the fingers and prevent fingernails from scratching the softened leather. Holding this wipe square, gently wrap around the 3 o'clock and 9 o'clock positions of the steering wheel, which are held the most.
These two positions at 3 o'clock and 9 o'clock are where hand sweat and dead skin accumulate the most. A bacterial study by the University of California found that the bacterial colonies gathered in these two areas exceed 2000 per square inch.
Although 2000 colonies are gathered per square inch, never scrub hard like wiping a table. Use a force of about 0.5 pounds (as light as pressing an elevator button) to draw circles on the surface.
Drawing circles on the surface can bring out the grease hidden in the leather grain without damaging the coating. Every time you finish wiping half of the steering wheel, flip the wipe in your hand and continue wiping with the clean side.
Continuing to wipe with the clean side is to avoid smearing the oil stains you just wiped off back onto the steering wheel. Next, deal with the most delicate left and right scroll wheels, which are the most easily damaged parts.
These parts are the most easily damaged because underneath the scroll wheels are precise circuit boards. If a few drops of water accidentally squeeze in, causing module short circuits, going to the service center to replace a scroll wheel part will cost 185 dollars.
To save this 185 dollars of wasted money, be sure to squeeze the wipe hard in the palm of your hand before wiping the scroll wheels. Squeeze until no water drops can come out, then use your fingertips to push the slightly damp wipe quickly across the scroll wheel gaps.
The time to quickly sweep across the scroll wheel gaps should not exceed 5 seconds to ensure no liquid residue. After completing this wet wiping step, what follows is the most important step in the entire cleaning process: drying thoroughly.
Many car owners are too lazy to do this step of drying thoroughly, resulting in the steering wheel aging in less than two years. You must prepare a microfiber towel with a thickness of over 350 GSM (grams per square meter).
Towels over 350 GSM have strong water absorption and can instantly suck away moisture like a vacuum cleaner. Cover the area just wet-wiped with the towel like a blanket, and press gently with your palm for a few seconds.
Pressing gently with the palm for a few seconds utilizes the capillary principle, allowing the towel to actively absorb water. Never use a dry towel to rub back and forth forcefully; the wet coating is the least wear-resistant at this time and will come off upon rubbing.
The wet coating is the least wear-resistant, and physical friction will rub off the anti-fouling layer on the surface that is only 0.5 microns thick. An auto interior laboratory in Texas specifically compared the consequences of different drying methods.
| Drying Method | Time for Natural Evaporation | Coating Wear after 100 Cleans | Mildew Risk (after 90 days) |
|---|---|---|---|
| Natural air dry | 15 - 20 minutes | 18% (Prone to water marks) | High (Mildew in crevices) |
| Ordinary paper towel | 5 - 10 seconds | 12% (Scratched by paper debris) | Medium (Paper fluff residue) |
| 350 GSM towel pressing | 3 - 5 seconds | < 2% (Basically undamaged) | 0% (Thoroughly dry) |
A thoroughly dried steering wheel should look matte without reflective highlights. If you find that it still feels sticky after drying, it means one wipe was used over too large an area and the oil was not wiped clean.
If the oil is not wiped clean, it is usually recommended to change to a new wipe for every half of the steering wheel cleaned. The cost of a wipe is less than 5 cents; for owners commuting more than 50 miles (about 80 kilometers) a day, wiping like this once a week is enough.
Wiping like this once a week can effectively prevent the acidic oils secreted by the hands from corroding the steering wheel. A 2021 survey of 500 Uber drivers showed that vehicles maintained with weekly cleaning had a 60% reduction in steering wheel wear rate.
With the wear rate reduced by 60%, your steering wheel will still look new after 5 years of use. In addition to the visible outer ring, don't forget to turn the steering wheel around to clean the blind spot on the back.
Cleaning the blind spot on the back is necessary because finger joints frequently rest there, resulting in more oil and dirt than the front. Rotate the steering wheel 180 degrees to face the back upwards, where lighting is good and operation is convenient, and you will see it is full of black grime.
The areas full of black grime are treated cleanly using the same "one wet, one dry" method. Once proficient, the entire process takes only 3 minutes, much faster than lining up for a car wash, while preserving the value of the interior.
Preserving the value of the interior entirely depends on this "One Wet, One Dry" habit. As long as you remember the three points of cooling down first, wiping gently, and drying thoroughly, using ordinary pure water wipes is also the safest.
Alcohol
Tesla's official Owner's Manual clearly states: When cleaning the interior of the Model 3, 70% Isopropyl Alcohol (IPA) is the only approved alcohol-based disinfectant.
Alcohol with a concentration higher than 90% evaporates too quickly (less than 10 seconds), failing to meet the contact time required to kill bacteria, and easily dissolves the protective coating on the polyurethane (PU) surface.
During operation, alcohol must be sprayed onto a microfiber cloth for wiping. Spraying directly onto the steering wheel is strictly prohibited to prevent liquid from seeping into the scroll wheel gaps and causing electronic component short circuits.
Concentration Selection
When going to the pharmacy to buy disinfectant, most people instinctively reach for the bottle labeled "99%", feeling that the higher the concentration, the faster and more thorough the sterilization.
The idea that the higher the concentration, the faster and more thorough the sterilization is completely unworkable on the Tesla Model 3's polyurethane steering wheel, and will even bring counterproductive effects.
The root cause of bringing counterproductive effects is that the bottle of high-purity alcohol lacks 30% purified water, and this water is the hero in protecting the interior and killing bacteria.
The hero "water" protecting the interior and killing bacteria plays a role in "slowing down" the alcohol in the 70% isopropyl alcohol solution.
Slowing down the alcohol is necessary because 91% or 99% high-concentration alcohol evaporates too wildly, completely drying out in less than 8 to 10 seconds when poured on the steering wheel.
The time window of drying out completely in less than 8 to 10 seconds is simply not enough for the alcohol to penetrate inside the bacteria or viruses to destroy their structures.
Destroying their structures requires time; when high-concentration alcohol contacts bacteria, it instantly "fries" and coagulates the outermost proteins of the bacteria like frying an egg.
The protein shell "fried" and coagulated like an egg instead forms a protective shield, locking the living bacteria inside; the alcohol cannot enter, and the bacteria will not die.
The phenomenon where alcohol cannot enter causing bacteria to not die was confirmed in a 2020 laboratory comparison, showing that 91% alcohol had an almost zero kill rate on some stubborn pathogens within 15 seconds.
Not only does an almost zero kill rate within 15 seconds fail to clean, but the high-concentration solvent will also turn around and attack the chemical coating on the steering wheel surface.
Attacking the chemical coating on the steering wheel surface is like wiping your face with strong makeup remover; 99% alcohol will forcefully extract the "oils" that maintain the softness of the synthetic leather.
Forcefully extracting the "oils" that maintain softness will cause the steering wheel to harden in just a few months. A 2022 materials testing report showed that the elasticity of the polyurethane coating that lost these oils dropped by 18%.
With elasticity dropped by 18%, when you grip the steering wheel forcefully or expose it to the summer sun, this layer of skin will no longer expand and contract with the heat, but will directly crack open.
The consequence of directly cracking open is that you need to spend over 600 dollars at a Tesla service center to replace a new steering wheel, which originally could have been avoided with a 3-dollar bottle of 70% alcohol.
A 3-dollar bottle of 70% alcohol can avoid damage because that 30% of water allows the solution to remain moist on the steering wheel for 25 to 30 seconds.
Remaining moist for 25 to 30 seconds gives the alcohol exactly enough time to penetrate the bacterial shell, while the moisture also dilutes the harshness of the solvent, so it does not instantly dissolve the coating.
Not instantly dissolving the coating is the first step in protecting your car asset. To intuitively understand the impact of liquids from different bottles on your car, look at the comparison below.
| Bottle Concentration | Actual Water Content | Survival Time in Car | Effect on Bacteria | Consequence for Steering Wheel |
|---|---|---|---|---|
| 70% (Recommended) | 30% | About 30 seconds | Completely killed | Safe and undamaged |
| 91% | 9% | About 15 seconds | Raw inside, cooked outside | Surface turns white |
| 99% | 1% | Less than 10 seconds | Ineffective | Coating cracking |
The data in the table clearly shows why Tesla's user manual only allows the use of 70% isopropyl alcohol, but that's not all; many people also make another mistake.
Making another mistake is casually picking up the hand sanitizer kept in the car to wipe the steering wheel, thinking this stuff is made of alcohol anyway.
Thinking this stuff is made of alcohol anyway is completely wrong; hand sanitizers usually add 1% to 3% glycerin or aloe vera gel to protect hands.
1% to 3% glycerin or aloe vera gel is moisturizing when applied to hands, but when applied to a synthetic material like a steering wheel, they dry and solidify in the crevices of the texture.
Drying and solidifying in the crevices of the texture will turn into a layer of sticky glue. This layer of glue not only looks disgusting but also acts like a magnet, attracting dust and dead skin.
After attracting dust and dead skin, your steering wheel will get dirtier the more you wipe, eventually turning into a petri dish for bacteria, so be sure to only use pure liquid 70% isopropyl alcohol.
Alcohol & Polyurethane (PU)
Tesla made a huge change in 2019; for environmental protection, they stopped using animal leather for the Model 3 steering wheel.
After stopping the use of animal leather for the Model 3 steering wheel, it was replaced by a synthetic material called polyurethane. The vegan leather bags people usually buy are also made of the same composition.
The same composition feels soft and elastic because the factory added about 15% chemical moisturizer into it during manufacturing.
Adding about 15% chemical moisturizer makes the feel of the steering wheel infinitely close to real leather; you won't feel it is stiff no matter how you pinch or rub it while driving.
The good feel that you won't feel stiff no matter how you pinch or rub it while driving is most afraid of encountering the rubbing alcohol people usually buy at pharmacies.
It is most afraid of encountering the rubbing alcohol people usually buy at pharmacies because alcohol is like an extremely high-purity, strong makeup remover.
Once the extremely high-purity, strong makeup remover touches the steering wheel, it will act like a sponge absorbing water, drilling into the tiny pores of the synthetic leather within a short 3 to 5 seconds.
After drilling into the tiny pores of the synthetic leather, the alcohol will dissolve all of the 15% chemical moisturizer used to maintain softness.
After dissolving all of the 15% chemical moisturizer used to maintain softness, when the alcohol evaporates into the air, it conveniently takes the oils inside away with it.
Because it conveniently takes the oils inside away with it, your steering wheel will have its moisture completely drained, just like hands that haven't had hand cream applied in winter.
The consequence of the moisture being completely drained was specifically counted at an auto repair shop in Los Angeles; all 200 damaged steering wheels they received in 2022 were due to owners spraying alcohol wildly.
Everything being due to owners spraying alcohol wildly causes the surface of the steering wheel to dehydrate. After dehydration, the synthetic leather will become as brittle as potato chips within the next 3 to 6 months.
After becoming as brittle as potato chips, as long as your hands sweat slightly, or your fingernails accidentally scratch it, the surface layer of the steering wheel will crack open like a snake shedding its skin.
The surface layer of the steering wheel cracking open like a snake shedding its skin reveals the unprotected, white or gray rough base underneath, which not only looks particularly ugly but also feels sticky.
It not only looks particularly ugly but also feels sticky because the industrial glue underneath melted upon encountering high temperatures, adhering all the dust from the air onto it.
After adhering all the dust from the air onto it, driving every day feels like holding a ball of playdough wrapped in sand, which is extremely uncomfortable.
The extremely uncomfortable driving experience forces you to go to the Tesla service center for help, where the staff will hand you a repair bill for over 600 dollars.
Handing you a repair bill for over 600 dollars is because peeling belongs to chemical corrosion and is not covered by the warranty, so you can only pay out of pocket to replace the entire part.
The expensive cost of only being able to pay out of pocket to replace the entire part can actually be completely avoided by understanding the temperaments of polyurethane and alcohol.
To understand the temperaments of polyurethane and alcohol, we can look at a car interior aging report published by a polymer materials testing center in California in 2023.
The published car interior aging report recorded 500 Teslas that used alcohol for disinfection year-round, and divided the process of the steering wheel breaking into several very obvious, life-like stages:
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Divided into several very obvious, life-like stages: The first stage is the oil-secretion period. After wiping continuously with alcohol 10 times, the steering wheel's original premium matte texture is gone, and it becomes shiny and oily.
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Becoming shiny and oily is like a person's nose sweating a lot; actually, the outermost thin anti-reflective protective film on the surface has been eaten away by the alcohol.
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After the outermost thin anti-reflective protective film on the surface is eaten away by the alcohol, it enters the second stage, which is the shriveling period; the thickness quietly shrinks by about 5%.
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Although the thickness quietly shrinking by about 5% is invisible to the naked eye, when you turn the steering wheel every day, the material can no longer withstand the pulling force.
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When the material can no longer withstand the pulling force, it will reach the third stage, the breakdown period, which is what we commonly call bubbling and crumbling; black leather flakes will shed all over the car.
Black leather flakes shedding all over the car sometimes also get stuck in the volume scroll wheels on the left and right sides of the steering wheel, causing the scroll wheels to be unresponsive when pressed.
Causing the scroll wheels to be unresponsive when pressed will affect your blind operations on the highway. To avoid danger, experts suggest breaking the habit of casually grabbing an alcohol spray and spraying it in the car.
Breaking the habit of casually grabbing an alcohol spray and spraying it in the car by switching to buying a pack of dedicated alcohol-free baby wipes at the supermarket, or spraying 70% alcohol onto a cleaning cloth.
When spraying 70% alcohol onto a cleaning cloth, it is enough as long as the cloth surface is slightly damp; never spray it to the point where water drips.
Never spray it to the point where water drips; take the slightly damp cloth and gently wipe a circle on the steering wheel, and the alcohol will dry by itself within 10 seconds.
The alcohol drying by itself within 10 seconds greatly reduces the time the strong makeup remover stays on the skin, so the oils don't have time to be extracted.
The oils not having time to be extracted is still not perfect enough; you also need to prepare a pure cotton towel usually used for washing your face, and dab a little clean water.
Dabbing a little clean water right after the alcohol has dried, and carefully wiping around the steering wheel again, is just like washing your face with clean water after removing makeup.
Just like washing your face with clean water after removing makeup, the addition of clean water can dilute and carry away all the trace alcohol molecules remaining in the tiny crevices.
Completely diluting and carrying them away can thoroughly interrupt the aging process of the polyurethane material. A used car appraisal agency in New York conducted a valuation comparison in 2021.
The valuation comparison looked at 1000 used electric cars and found that vehicles that consistently finished by wiping with clean water had steering wheels that still retained their factory matte feel within five years.
The steering wheel still retaining its factory matte feel within five years allowed the vehicle's interior section to be valued on average at least 800 dollars higher when listed for sale.
The benefit of being valued on average at least 800 dollars higher is simply because the original owner did one extra small action of wiping their face with clean water.
Doing one extra small action of wiping their face with clean water can perfectly solve the contradiction between sterilizing and protecting synthetic leather, allowing you to touch a comfortable new steering wheel every day.
Safe Cleaning Steps
When Tesla workers assemble cars at the California factory, they have a set of cleaning procedures like washing fine china in a kitchen.
A set of cleaning procedures like washing fine china in a kitchen is to correct the habit people usually have during major cleaning of grabbing disinfectant and spraying wildly at the cabin.
The habit of grabbing disinfectant and spraying wildly at the cabin triggered massive trouble in Texas in 2021, when 150 cars were sent in for repairs because of it.
The reason 150 cars were sent in for repairs at that time was very simple: owners sprayed 70% alcohol mist onto the steering wheel like watering flowers.
By spraying 70% alcohol mist onto the steering wheel, the excess liquid flows down along the curve of the leather surface and drills into the gaps of the scroll wheels used to switch songs on the left and right sides.
The liquid drilling into the gaps of the scroll wheels used to switch songs will soak and ruin the thin circuit boards inside, leaving you to pay out of pocket to replace the entire component.
The painful experience of only being able to pay out of pocket to replace the entire component reminds us that going to the supermarket to buy two microfiber cloths that feel as soft as baby fuzz is absolutely necessary.
Microfiber cloths that feel as soft as baby fuzz have tiny fuzz on them that can grab dust away without scratching the synthetic leather.
The microfiber cloth that can grab dust away without scratching the synthetic leather had a wear rate of only 0.01% on the leather surface in a 1200-cycle abrasion test in 2020.
Having a wear rate of only 0.01% on the leather surface makes it the only recommended car wiping tool. After preparing the cloth, you need to strictly follow a life-like action checklist:
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The first step in strictly following a life-like action checklist is to spray alcohol onto the first cloth you just prepared; absolutely do not spray directly into the cabin.
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Absolutely do not spray directly into the cabin; you just need to press the nozzle two to three times so the cloth surface appears slightly damp, and feels slightly moist to the touch.
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The state that feels slightly moist to the touch usually only consumes 3 to 5 milliliters of alcohol, which is just enough for you to wipe the steering wheel completely once around.
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When wiping the steering wheel completely once around, your movements should be as gentle as taking a tissue to wipe rice grains from the corner of your mouth; never rub vigorously back and forth like scrubbing a pot.
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Never rub vigorously back and forth like scrubbing a pot because when a person exerts force, the pressure applied to the leather surface by the hand combined with the dissolving power of the alcohol will instantly rub off the top layer of skin.
The lesson of instantly rubbing off the top layer of skin comes from a 2022 car owner gathering in Florida, where 45% of the 300 owners who love to wipe their cars vigorously had steering wheels that turned white.
That 45% of the 300 owners who love to wipe their cars vigorously had steering wheels that turned white tells us that gently gliding over the leather surface is completely sufficient to kill 99.9% of bacteria.
Gently gliding over the leather surface being completely sufficient to kill 99.9% of bacteria is because alcohol sterilizes by penetrating into the pathogens itself, not relying on you using brute force to scrub the pathogens to death.
Not relying on you using brute force to scrub the pathogens to death, stop after wiping one circle, and give the alcohol about 10 to 15 seconds to evaporate and dry in the air by itself.
Letting it evaporate and dry in the air by itself does not mean the job is done; now you need to take out the second clean cloth you prepared, and spray a little bit of the pure water you usually drink onto it.
Spraying a little bit of the pure water you usually drink onto it, making the cloth slightly damp as well, and then taking it to carefully re-wipe the areas just wiped with alcohol.
Carefully re-wiping the areas again is just like a woman having to wash her face with clean water after using makeup remover; the water can wash away the makeup remover still stuck in the pores that hasn't completely dried.
The water washing away the makeup remover still stuck in the pores cuts off the escape route for residual alcohol to continue secretly draining the moisturizing oils inside the steering wheel.
After cutting off the escape route for draining the moisturizing oils inside the steering wheel, your synthetic leather steering wheel will not age and harden prematurely, and its service life will be greatly extended.
The service life being greatly extended received very real data support in a used electric car transaction survey in California in 2023.
The report that received very real data support showed that among 500 randomly inspected cars driven for over three years, 92% of steering wheels that were consistently finished by wiping with clean water were as perfect as new.
The fact that 92% of steering wheels consistently finished by wiping with clean water were as perfect as new made it very easy for owners to pass interior condition inspections when selling their cars.
The final step to making it very easy to pass interior condition inspections is the finishing touch: flip the cloth that was sprayed with water, and use the dry side to soak up the water on the steering wheel surface.
Using the dry side to soak up the water on the steering wheel surface can prevent water droplets from remaining on the black leather surface, which would turn into ugly white water stains after drying.
Turning into ugly white water stains after drying is a mood-ruiner. After completing the preventive actions, the entire process is completely over, taking only two minutes in total.
Taking only two minutes in total can completely clean out all the pathogens left in the cabin after your cold is completely gone, while doing absolutely no harm to the car you spent a lot of money on.
Leather Safe
The vegan leather of the Tesla Model 3 is essentially a polyurethane (PU) synthetic material, completely different in structure from animal leather.
This material does not require oil maintenance but is extremely sensitive to solvents. The true "leather safe" standard is: use a neutral cleaner with a pH value between 7.0 and 8.0, or mild soapy water diluted at a ratio of 1:200.
If disinfection is required, 70% Isopropyl Alcohol (IPA) is the upper concentration limit, and the contact time must not exceed 30 seconds.
The use of melamine sponges is strictly prohibited; their microscopic abrasive power is equivalent to P3000 sandpaper, and will permanently wear away the matte protective layer on the steering wheel surface, leading to replacement costs exceeding 700 dollars.
Polyurethane & Chemical Reactions
Since 2019, the automobile manufacturing plant located in California began installing steering wheels wrapped in polyurethane materials on vehicles, replacing traditional animal leather that required mink oil for maintenance. The surface of traditional animal leather is covered with tiny pores, which can absorb moisture and lanolin from lotions.
Moisture and lanolin completely cannot penetrate into the non-porous structure of the polyurethane synthetic material. The non-porous structure is like the non-stick coating of a kitchen pan, blocking all hand oils on the surface.
After blocking all hand oils on the surface, if not cleaned promptly, chemical reactions will quietly occur. In 2022, a car detailing shop in Florida collected 150 bubbled and peeling old steering wheels for testing.
After testing the old steering wheels, it was found that the surface of 82% of the damaged samples was covered with high concentrations of Avobenzone and Octocrylene. Avobenzone and Octocrylene are the most common UV absorbers in sunscreens commercially available in North America.
Under the high temperature of sun exposure, UV absorbers will quickly dissolve the transparent protective film on the polyurethane surface. When dissolution occurs, the protective film, originally only 0.05 mm thick, will become soft and sticky like a Band-Aid soaked in water.
The soft and sticky protective film is extremely easy to be scratched by rings or rough skin on the driver's hands. In a 2023 simulated daily driving test, hands with sunscreen residue rubbing on the steering wheel 500 times caused the coating to rupture.
After the coating ruptures, the plasticizers wrapped inside the material begin to slowly volatilize and be lost into the air. Plasticizers are chemical components that keep the plastic texture soft and elastic; once lost, the steering wheel becomes brittle and hard.
A brittle and hard steering wheel will be destroyed at an accelerated speed when encountering high-concentration alcohol wipes. The Centers for Disease Control and Prevention in North America typically recommends using 70% isopropyl alcohol for surface disinfection in home environments.
If surface disinfection uses industrial alcohol exceeding a 70% concentration or hand sanitizer with abrasive particles, the liquid will instantly strip the polymer of its remaining chemical moisture. The loss of chemical moisture will cause deep, visible cracks to appear on the steering wheel surface within 30 days.
Deep, visible cracks usually start spreading from the 3 o'clock and 9 o'clock positions where drivers are accustomed to holding for long periods. The spreading cracks will form countless tiny crevices, becoming collectors for massive amounts of dust and human hand sweat.
The collectors of massive amounts of dust and human hand sweat will quickly turn into micro chemical reactors inside the hot cabin in summer. When a vehicle is parked in an unshaded open-air parking lot in Arizona, the interior temperature can reach 65 degrees Celsius within two hours.
A high-temperature environment of 65 degrees Celsius will allow salts and free fatty acids in sweat to launch a strong corrosion on the polyurethane. Strong corrosion not only alters the physical tensile strength of the material's underlying layer, but also completely destroys the matte visual effect of its surface layer.
The matte visual effect of the surface layer relies on an uneven micro-structure on the microscopic level that diffusely reflects light. A 2024 interior census of 200 three-year-old vehicles showed that the glossiness of steering wheels frequently wiped by owners with household glass cleaners severely exceeded standards.
The glossiness of the steering wheels severely exceeding standards is mainly because most degreasing household glass cleaners contain ammonia. Ammonia not only dissolves stubborn grease like dish soap, but it also acts like microscopic sandpaper, completely polishing away the diffuse reflection micro-structure on the polyurethane surface.
After completely polishing away the diffuse reflection micro-structure on the polyurethane surface, the steering wheel will look as shiny and greasy as if coated with a thick layer of lard. To quantify the destructive degree of different daily liquid products on the visual and tactile feel of the steering wheel, independent testing agencies introduced long-term comparative observation data.
| Contact Substance | Contact Frequency | Bubbling Rate after 12 Months | Sample Quantity (pcs) | Coating Thinning Ratio |
|---|---|---|---|---|
| Pure Water Slightly Damp Towel | Once a week | 0% | 50 | 0.5% |
| 70% Isopropyl Alcohol Wipes | Once a day | 12% | 50 | 8.0% |
| Ammonia Glass Cleaner | Once a week | 45% | 50 | 22.0% |
| SPF 50 Sunscreen | Daily contact | 88% | 50 | 41.0% |
The long-term comparative observation data clearly demonstrated the powerful destructive force of sunscreens and household ammonia cleaners. The bubbling rate as high as 88% in a controlled environment confirmed the polymer's extreme intolerance to mineral oil components in daily cosmetics.
Once the extremely intolerant chemical reaction starts, no maintenance oil or repair fluid can reverse it. At a large auto service center in Los Angeles, technicians process about 40 warranty claim applications per month for peeling caused by chemical corrosion.
Warranty claim applications are usually rejected because automakers strictly classify localized peeling caused by daily chemicals as external man-made damage. External man-made damage forces owners to pay over 700 dollars out of pocket to replace the entire damaged steering wheel assembly.
The expensive cost of replacing the entire damaged steering wheel assembly can be completely avoided by changing the wiping habit every day when getting out of the car. Before unplugging the charging gun and getting into the car every day, ensuring that hands are not coated with greasy lotion can cut off over 90% of fresh grease adhesion from the source.
Before fresh grease adhesion penetrates into the gaps between large molecules in the polyurethane surface layer, it is merely a physical presence staying on the outer surface. To wipe away the physical presence staying on the outer surface, you only need to soak a microfiber cloth in warm pure water with a pH value of 7.0 and wring it out completely.
Cleaner Ingredients
When you walk around North American supermarkets like Walmart or Target, the backs of colorful car interior cleaning sprays on the shelves are affixed with ingredient lists. The long strings of chemical names on the ingredient lists dictate the service life of that polyurethane plastic steering wheel in the car. The basic condition dictating the service life of that polyurethane plastic steering wheel in the car is whether the liquid itself is mild and neutral enough.
Whether the liquid itself is mild and neutral enough is scored by pH value in the chemical system, with 7.0 being the perfect neutral state of pure water. In 2022, a car care podcast in California randomly purchased the top 50 best-selling interior stain removers in supermarkets to conduct test strip testing. After conducting test strip testing, it was found that as many as 78% of strong stain remover products had a pH value exceeding 9.0, falling into the alkaline category.
The liquids falling into the alkaline category usually have sodium hydroxide or ammonia added, which is very similar to the harsh degreasing agents used to scrub kitchen range hoods at home. Harsh degreasing agents used to scrub kitchen range hoods will instantly dissolve animal fat when sprayed on a greasy plate, but when sprayed on vegan leather, they will melt away the matte protective film on the surface together with it. The process of melting away the matte protective film on the surface together with it is the physical cause of the steering wheel starting to feel sticky to the touch.
The physical cause of the steering wheel starting to feel sticky to the touch was fully corroborated in a 2023 questionnaire survey of 500 ride-hailing drivers. The survey results, which were fully corroborated, showed that among the driver group who wiped their cabin interiors daily with ammonia-containing glass cleaner, 42% applied to the service center to replace a peeling steering wheel in less than a year. Applying to replace a peeling steering wheel led many people to start looking for safe cleaning formulas in the ingredient lists of daily necessities.
The first step in finding safe cleaning formulas is to look for the English description of non-ionic surfactants printed on the bottle. Non-ionic surfactants are actually most common in unscented baby wipes sold in supermarkets; they rely on gentle plant extracts to wrap up and carry away dirt, rather than relying on strong acids or strong bases for forced corrosion. Relying on strong acids or strong bases for forced corrosion is a common formulation method for many household cleaners with citrus scents; when buying cleaners at the supermarket, high-risk ingredients must be strictly avoided.
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Ranking first among the high-risk ingredients to be strictly avoided is D-Limonene. This natural solvent, smelling like fresh orange peel, was confirmed by an independent testing agency in 2020 to cause a 40% drop in the material's tear resistance.
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The disaster of causing a 40% drop in the material's tear resistance will also occur in the action of immediately gripping the steering wheel after rubbing hands with hand sanitizer containing an alcohol concentration above 75% every day.
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If the action of gripping the steering wheel is accompanied by the residue of mineral oil components common in hand creams, it only takes 30 days to make the vegan leather swell and bubble like a Band-Aid soaked in warm water.
The source of swelling and bubbling is often misrecognized animal leather maintenance products; many people have the habit of directly applying the leather maintenance oil used to wipe genuine leather sofas at home into the car cabin. Leather maintenance oil applied into the car cabin is usually rich in lanolin and natural beeswax, and the natural pores on the surface of traditional cowhide can easily absorb these moisture and nutrients. Easily absorbing these moisture and nutrients completely fails on Tesla's polyurethane material because there are no natural pores on the surface of synthetic plastics.
Since there are no natural pores on the surface of synthetic plastics, the thick maintenance oil applied all floats on the outermost layer, absorbing dust from the air, and eventually turning into a layer of oily sludge. After turning into a layer of oily sludge, when the driver turns the steering wheel in daily life, the palms pressing against tiny dust particles act like a facial scrub, frantically rubbing against the fragile factory coating. Frantically rubbing against the fragile factory coating, accumulating over time, will make the steering wheel surface look reflective and greasy, as if coated with a thick layer of hair wax.
The degree of reflective and greasy appearance was precisely quantified by light measuring instruments at a 2024 on-site assessment meeting for 200 three-year-old used cars in Texas. After being precisely quantified by light measuring instruments, it was found that vehicles frequently using leather maintenance oil had steering wheels nearly 3 times more reflective than factory new cars. With the steering wheel's reflectiveness nearly 3 times higher than factory new cars, the most economical prescription given by many professional car wash shops in North America is to mix one drop of unscented dish soap with a large glass of warm water.
In the daily formula of mixing one drop of unscented dish soap with a large glass of warm water, as long as the volume ratio of dish soap is strictly kept under 1 to 200, its degreasing power is just right. Having just the right degreasing power can wash away the sweat left by hands while absolutely not damaging the polyurethane coating. For the diluted mixed water that absolutely will not damage the polyurethane coating, after wiping, you must immediately use a completely dry microfiber towel to thoroughly absorb the surface moisture.
Thoroughly absorbing the surface moisture is to prevent hard water minerals like calcium and magnesium in household tap water from remaining in the tiny textured grooves of the synthetic leather, drying and turning white. The white scale that dries and turns white, along with any soap liquid residue, will continue to undergo an extremely slow chemical reaction under the summer sun exposure in Los Angeles parking lots. The extremely slow chemical reaction will accelerate significantly in the high temperature of 60 degrees Celsius inside a closed cabin, ultimately causing the steering wheel edges to age and crack prematurely within a cycle of about two years.
Tool Selection
When going to North American supermarkets like Home Depot or Target to buy chore tools, many people will conveniently pick up a box of magic erasers used to wipe kitchen walls. Magic erasers used to wipe kitchen walls have miraculous effects on TV shopping; just wet them with water, and they can cleanly wipe away marker traces or years of oil grime.
The white sponge block that can cleanly wipe away years of oil grime by just wetting it with water is actually an ultra-fine microscopic sandpaper made of melamine foam. If the ultra-fine microscopic sandpaper made of melamine foam is used to wipe the polyurethane steering wheel in the car, it is equivalent to scraping that layer of synthetic leather with sandpaper used to polish wooden furniture.
Scraping that layer of synthetic leather with sandpaper used to polish wooden furniture will immediately rub off the anti-reflective matte coating on the surface like rubbing off dead skin. The violent destruction of rubbing off the coating like dead skin was vividly demonstrated in a sample of 150 scrapped steering wheels at a Los Angeles auto repair shop in 2021.
Among the 150 scrapped steering wheel samples from the Los Angeles auto repair shop, 68% of the bald spots on the surface were caused by the owners themselves wiping excessively hard with magic erasers. Permanent high-gloss spots caused by the owners wiping excessively hard with magic erasers cannot be repaired by any chemical agents, forcing everyone to switch to using paper towels to wipe away sweat.
Being forced to switch to using paper towels to wipe away sweat is another common misconception about daily tools that is easy to fall into. The misconception about daily tools is that kitchen paper towels usually feel soft, but once soaked in soapy water or disinfectant to wipe synthetic leather textures, the wood fibers in the paper will become like thorny brushes.
The wood fibers in the paper becoming like thorny brushes created massive trouble in a 2022 questionnaire on interior cleaning habits among 300 car owners. The data showing the massive trouble created indicated that a staggering 85% of respondents who used paper towels to wipe their cars complained that the crevices of their steering wheels were stuffed with white paper shreds.
Complaining that the crevices of the steering wheel were stuffed with white paper shreds is because wood pulp paper, when encountering friction, sheds massively and gets stuck in the stitching holes on the edge of the steering wheel. The paper scraps stuck in the stitching holes on the edge of the steering wheel are very difficult to clean out; picking at them forcefully easily breaks the stitches, which is why professional car wash shops all use microfiber towels.
Since professional car wash shops all use microfiber towels, when going to Costco to buy towels, pay special attention to the gram weight number printed on the packaging bag. The gram weight number printed on the packaging bag is called GSM in English, representing the thickness of the towel; thick towels usually used to wipe water droplets off the car body exterior generally exceed 600 GSM.
Taking a thick towel generally exceeding 600 GSM into the cabin to wipe the steering wheel will make you unable to feel the pressure applied by your fingers because it is too thick. Because of the inability to feel the pressure applied by the fingers, the North American Car Care Association demanded in 2023 that owners purchase borderless thin towels with a thickness of 300 GSM.
By purchasing a borderless thin towel with a thickness of 300 GSM, the thin layer of cloth allows you to clearly feel the friction resistance of your fingers at the 3 o'clock and 9 o'clock positions of the steering wheel. Feeling the friction resistance of your fingers at the 3 o'clock and 9 o'clock positions allows you to stop and withdraw your hands in time when you feel an astringent sensation.
Stopping and withdrawing your hands in time when feeling an astringent sensation can save that film in the area most prone to bubbling.
Saving that film in the area most prone to bubbling was proven extremely effective in data statistics from a Texas auto detailing chain for 200 old cars in 2024. The extremely effective results proven in the data statistics showed that owners who consistently used thin borderless towels to wipe their interiors had a steering wheel bubbling rate of only 4%.
The excellent performance of the steering wheel bubbling rate being only 4% is also due to the borderless towel removing the hard nylon stitched edge around the perimeter that easily scratches the leather surface. After removing the hard nylon stitched edge around the perimeter that easily scratches the leather surface, to deal with hand cream residues in the crevices, you must go buy a brush.
When you must go buy a brush, absolutely do not go to the hardware section of the supermarket to buy the kind of hard-bristled plastic brush used for brushing shoes. If you go to the hardware section of the supermarket to buy the kind of hard-bristled plastic brush used for brushing shoes, the rigid nylon bristles will pierce into the dense pores of the polyurethane surface layer like needle points.
The rigid nylon bristles piercing into the dense pores of the polyurethane surface layer like needle points was very common in a 2019 survey of 120 interior parts damaged by artificial scrubbing. The very common situation in the survey was that 45% of the steering wheel stitches were picked and broken by hard-bristled brushes being forcefully pulled back and forth.
Once the stitches picked and broken by hard-bristled brushes being forcefully pulled back and forth unravel, the wrapped leather becomes loose and slippery, so knowledgeable veterans go to the cosmetics section to buy an animal hair brush. Buying an animal hair brush in the cosmetics section, such as a soft brush made of pure horsehair, has enough elasticity when dry to pick dust out of the stitches.
Having enough elasticity when dry to pick dust out of the stitches, once dipped in soapy water, natural hair becomes extremely soft, just like a woman's powder brush. Natural hair becoming extremely soft, just like a woman's powder brush, can gently sweep out residual cosmetic foundation without scratching the coating.
Gently sweeping out residual cosmetic foundation entirely relies on rubbing in circles rather than forcefully brushing in straight lines.
The required action of entirely relying on rubbing in circles rather than forcefully brushing in straight lines was strictly adhered to by 50 technicians at a professional interior restoration center in California in 2020. The operation manual strictly adhered to by technicians requires that the time spent brushing a dirty spot in circles must absolutely not exceed 10 seconds.
The time spent brushing a dirty spot in circles absolutely not exceeding 10 seconds is to prevent prolonged friction from generating heat that softens the synthetic plastic. To prevent prolonged friction from generating heat that softens the synthetic plastic, immediately after brushing for 10 seconds, you must use a slightly damp microfiber cloth to thoroughly absorb the dirty water on the surface.
Thoroughly absorbing the dirty water on the surface can prevent any liquid from flowing into the inside of the steering wheel along the tiny holes of the stitches. Preventing any liquid from flowing into the inside of the steering wheel along the tiny holes of the stitches can completely eliminate the occurrence of water ingress short circuits in the circuit boards underneath the multi-function scroll wheels and buttons.
