Can laundry detergent be used to wash a car?

[DakotaLee]

It is not recommended to use dishwashing liquid to wash a car because: Car wash solutions generally have a pH value of 7-8, which is neutral. Dishwashing liquid is also neutral, so using it to wash a car should not cause any damage. However, the foaming ability and lubricity of dishwashing liquid are far inferior to those of car wash solutions, so it is still not advisable to use dishwashing liquid for car washing. For an ordinary car, it doesn't make much difference what you use to wash it. But for a high-end car, if you particularly cherish your vehicle or want to avoid potential damage, it's better to choose a neutral, environmentally friendly detergent. Car wash towels should be categorized and not used indiscriminately. Towels used to wipe the lower part of the car body contain a large amount of fine sand that cannot be washed off, and such towels can easily scratch the car's paint.

[OAvery]

I don't recommend using laundry detergent to wash cars because it's too harsh and can directly damage the paint. I once tried it myself to save time, and it left a bunch of spots on the car's surface, making it rough and dull. Later, when I took it to the repair shop, the mechanic said laundry detergent is too alkaline—it easily strips off the car wax and may even corrode the rims or rubber seals. What's worse, the wastewater from washing can harm the grass when it flows onto the ground. Now, I stick to professional car wash soap, which costs just 10 yuan a bottle and lasts a whole month. When washing, I use a soft brush and a pressure washer, gently spraying to get it clean and safe. Regular washing also helps extend the paint's lifespan, making maintenance much easier. After all, a clean car not only looks fresh but also feels better to drive—there's no need to risk saving a few cents.

[IkerRose]

As someone who frequently hand-washes my car, I understand that laundry detergent is unsuitable for car washing. While it can remove dirt, its chemical composition damages the vehicle's protective coating. I've tested with pH strips—laundry detergent registers above 10, far exceeding a car's tolerance. After washing, the paint becomes brittle, and over time fine cracks appear, especially noticeable on black cars which also lose their luster. In contrast, dedicated car wash solutions contain pH-neutral formulas with conditioners to maintain gloss, delivering excellent results every time. I recommend choosing products with wax additives and using two sponges alternately. This method not only washes efficiently but also minimizes scratch risks. Protecting your car starts with these details, making long-term maintenance more cost-effective and effortless.

[StDallas]

From an environmental perspective, I don't recommend using laundry detergent to wash cars because it contains large amounts of phosphates and fragrances, which can pollute water sources and soil after washing, affecting small fish ecosystems. I've switched to natural car wash liquids myself, such as biodegradable plant-based formulas, which are gentle and safe to use, and the water used for washing can even be used to water plants. Occasionally trying a neutral shampoo is also a good option, as it's better for the car to have fewer chemicals; remember to wash frequently but avoid harsh products, thus protecting both the planet and your beloved car.

[HannahDella]

To save money, many people use laundry detergent to wash their cars, but I found it not worth the effort after trying it; initially saving a few bucks ended up making the car surface rough and stripping off all the wax, costing hundreds to reapply wax later. It's better to buy regular car wash liquid, which costs just over 10 yuan; or make some mild soapy water by mixing dish detergent with warm water, which is much safer. Control water usage while washing to avoid waste; maintaining a frequency of once a month is enough, saving time and protecting the car, making your wallet happier in the long run.

[DeConnor]

Prioritize car safety and never use laundry detergent to wash your car; its strong alkalinity can erode the paint and rubber seals, and it accelerates metal corrosion in summer. Once, after washing, bubbles appeared around the rear window, the seals deformed, and rainwater seeped in, damaging the electrical system. Switch to a dedicated car wash solution, which produces ample foam that rinses off easily without leaving stains; use a soft cloth to wipe from top to bottom with minimal force to avoid scratches. Regular maintenance like this keeps the car surface smooth and durable, ensuring a safer ride.