I opened a car wash shop in my hometown in the countryside. People in the village usually have a lot of mud in their cars, especially when it rains. How much pressure does it take to wash the car?

Stress is hard to change, and this problem can be solved without changing it. The specific method is to break up the soil with a leather hammer, then soak it with a water gun, then deal with other parts that are easy to wash first, and then turn around and wash the thick mud off the chassis. When the foam is soft, it will be washed clean.