As I mentioned before, one of my passions is cars. I love washing my beloved car. Personally, I will feel a bit disappointed if the tires are dirty even though the body is super clean. I came across an online article "The Proper Washing Method of Tires And When to Replace Them". I would like to summarize and share some of the interesting points here. It is easily noticeable when tires are dirty. The article said that washing them too often with detergents can damaged them. The main parts of tires are made of rubbers and they are very delicate. They starts aging and are damaged by ultraviolet rays. That's why there are products available that can be applied to the tire surface to help slow the aging process. However, washing tires too often with/using detergents might remove the protective film. So, how should we wash them? The recommended best practices are as follows, 1) Wash the inside of the tire housing(mudguards) thoroughly with high pressure water. 2) Scrub tires and wheels with a brush and sponge. 3) Get rid of small stones out of the tire threads with a brush. 4) Wipe water out with a cloth. Get rid of water on the wheels so that water stains are not left on the wheels. I'll try to follow these instructions in the future when I wash tires.