2. If the car is splashed with cement for more than 12 hours, the cement has basically hardened. You can go to the drugstore to buy some acidic water and dip your brush in cement. Cement will be dissolved by acidic liquid and then washed off with water. If it is difficult to wash, I suggest you wash it with hydrochloric acid, which will not hurt the car body. If you coat it on cement, it will be dissolved by acid immediately. Then rinse it clean.
Because cement is alkaline and hydrochloric acid is strong acid, it can only have a better effect on alkalinity. You can try it yourself without hurting the car.
3. You can also try the following methods: pour it with gasoline, and pull off the cement by hand when the paint softens slightly (suitable for large-scale demolition).
If it can't be removed, it can only be treated with sand wax and polishing wheel. The price varies from car to car. If the area is too large, you can find a way to take insurance.
Extended data:
1, cleaning frequency, experts suggest driving in first-tier cities in Beijing, Shanghai or Guangzhou, supporting facilities, pictures, quotation), usually once every two weeks, but this is not absolute, according to the specific use situation, more and more, but if dust, dirt, rain, etc. In this case, the owner should clean the vehicle as soon as possible to eliminate the acidic corrosive paint. But frequent car washing is not appropriate, which will accelerate the oxidation of car paint.
2. Don't choose to wash the car at noon when washing the car, because water forms a typical convex lens on the water surface, and the role of paint will produce local high temperature, which will affect the luster of the car paint surface after a long time. If possible, clean the car in a covered place and make sure to dry it before driving out, so that the paint will be better protected.
3. In the past, some informal car washing shops used car washing agents such as detergent to wash cars, so the damage to car paint was the greatest. In fact, the choice of car wash liquid is very insightful. Do not choose acidic or alkaline products. Choosing a neutral car wash liquid is the most important.
If you want to do it yourself and the cost is low, you can choose to use mixed water of neutral liquid such as shampoo or shower gel as shampoo. Under normal circumstances, 20L bucket of water and part of shampoo with 10 coke lid can achieve good shampoo effect.
When washing the car, you should choose clean water that does not contain harmful impurities such as sediment, oil, acid and alkali. If you choose clean water, you need to ensure that there are no impurities such as sand or soil particles. In order to avoid accidental injury, paint the car when washing it.