Cloth brush: This kind of brush material was first introduced to Taiwan Province Province from Japan in 1990s, and then to the mainland. Brushes are characterized by good cleanliness, short service life and easy to be wrapped with gravel. In the process of car washing, if it is not pretreated by high-pressure water gun, the gravel on the car body is easily wrapped by brush cloth, leaving obvious scratches on the car body. Cloth brushes are also easy to stick to the wiper, so it is necessary to fix the wiper with adhesive tape during use, otherwise it will be easily damaged. However, due to the low cost, this material is still selected by some manufacturers. Accidents are easy to occur in the use of small car washing machines. This kind of brush was popular in China for less than two years, and it was gradually abandoned by major manufacturers. At present, it is mainly used for various large-scale car washing equipment. The brush for car washing machine is characterized by lightness, high cleanliness and good dehydration, which is especially suitable for use in northern areas. Similarly, there are differences between domestic and imported foam brushes. Domestic foam brushes are low in price, loose in material, easy to break, and have little contact with the car body, which affects cleanliness. Domestic foam brushes are basically processed into thin strips, which is very unfavorable for cleaning dirty parts of vehicles. Imported foam brushes (mostly from the United States) are dense and wear-resistant. In particular, the horizontal installation method effectively solves the excessive flexibility of foam brushes, which can not only protect the paint surface of vehicles, but also provide sufficient cleaning power. The dehydration performance is obviously better than that of domestic foam brushes, but its high import price is unacceptable to most car washing machine manufacturers.