& nbsp ; Washing cars with detergent is the most harmful to cars The most fundamental purpose of washing a car is still to clean the stains on it. It definitely cannot be cleaned only by water. What we use to wash the car really matters. Now, there are basically three types of cleaning agents used in car wash shops: detergent, dish soap, and specialized car wash liquid. Some car owners go to the car wash shop and see the staff working very seriously, with bubbles flying all over the place, with seemingly strong "cleaning and stain-removal" capabilities, even the dirtiest cars seem not to be a problem, and after washing, the car looks pretty clean from the outside. If you want to know exactly what the car wash shop uses to wash your car, you can pinch those bubbles with your fingers or sniff them with your nose - detergent! That's right, some car wash shops actually use detergent to wash cars. Detergent is an alkaline cleaning agent that can cause great damage to the car paint. If you keep washing your car with detergent, the surface of the car will gradually lose its luster. The corrosion caused by detergent on the car paint is hard to notice in the short term, so many car owners don't know how serious it is. The boss of the car wash shop knows that detergent can ruin the car, so why do they still use it? The fundamental reason is that detergent is low-cost and effective quickly. Some car wash shops also use dish soap to wash cars. The shop owner usually buys large buckets of dish soap similar to those used in the catering industry. Although this kind of dish soap is only tens of yuan cheaper than specialized car wash liquid, it is still widely used in car wash shops. An owner of a car beauty shop said: "Specialized car wash liquid is neutral and will not damage the car paint, but it is slightly more expensive than dish soap. Nowadays, water fees are getting more and more expensive, and the profit margin of car washing is getting lower and lower, so shop owners are trying every possible way to reduce costs." This boss also revealed a trick to distinguish between good and bad products: look at the hands of the car washer while they're washing the car. If the car washer's hands turn white, it proves that the car wash liquid they use has problems and they have been using alkaline cleaning agents for a long time. From the outside, car washing seems like a simple physical labor job, seemingly without any technique, but the water flow used in car washing is also very particular. A more professional car wash shop will never start by wildly spraying with a high-pressure water gun; generally, the first round must be slow-flowing water, flushing from top to bottom, carrying away the dust particles on the car with the water flow. If you start with the high-pressure water gun, it would be equivalent to making the dust particles on the car paint surface do "friction exercise". Sometimes, car owners often wash their cars at roadside stores out of convenience. If you observe carefully, you will find that their buckets are full of sand, which is no different from sandpaper rubbing the car. Some car wash shops also use towels that have been discarded by hotels. These towels may look new and white, but they are actually quite rough and can also harm the car. Be careful when washing your car, beware of punctures Since the cost of urban water usage has been rising continuously, car washing is no longer a separate source of income. Many car beauty shops and car repair factories treat car washing as a supplementary project. Sometimes, after the car owner drives their car to the repair shop, the car is washed but the tires are deflated afterward. People know there is something suspicious going on, but they just cannot uncover the truth. An employee who once worked in a repair shop told me about the inside story. Some repair shops, in order to take on more business, secretly let the car washers puncture the tires while washing the car. The tool used to puncture the tire is usually a piece of iron wire with one end sharpened, hidden in the cloth used to wipe the car.
It is understood that during the car wash, it is divided into three parts: the first step is to rinse the car with a water gun; the second step is to apply car wash liquid; the third step is to clean the interior of the car. The first two steps won't involve any tricks, but when cleaning the interior, everyone crowds around, blocking the view, and then starts puncturing the tires. They usually choose the right side of the car because the driver is on the left side, and stands on the left side after getting out of the car, so puncturing the right side of the tire is less likely to be noticed. Meanwhile, the loud sound of the vacuum cleaner can cover up the sound of letting the air out.