Generally, the car parked outside does not often open the brake drum brake will rust. It is best not to drive for a long time to disconnect the negative battery, wrap the car, and store it for a long time. In fact, the wheel rust does not mean that the wheel is really rusty, but because the car is in a humid environment for a long time, plus the car is used for a long time, it will certainly bump, the surface of the wheel will inevitably appear scratches and other damage, and then go outside to wash the car when encountered some bad detergent containing acid and alkali, resulting in corrosion and rust of the wheel. If the rust is not very serious, you can first use a very fine water sandpaper dipped in water to gently grind off the rust, completely wipe, coated with a layer of primer, to ensure that the rust will not expand, aggravate. If the new scratch, can be wiped directly after the primer, the general vehicle is equipped with a small pot of original paint. This treatment is not pretty, but it is not a problem in small areas.