Is it necessary to wash the car in rainy days? Washing is healthier.

This is necessary. In fact, car washing is mainly to wash all kinds of dust stuck on the paint surface. Some dust has strong adsorption, so rain is difficult to wash off. It is this kind of dust with strong adsorption that will change the color of car paint for a long time, make the car look old and affect the life of car paint. If you want to resell it in the future, the sale will be worse and the price will be worse.