1. Prepare special dry cleaning agent (common in supermarkets), or use high-quality solvent gasoline or alcohol. 2. Remove the dust from the clothes surface. You can hit it with a cane. If it is leather, you can suck the dust with a wet towel. 3. Dip a soft brush or towel in a little dry cleaning agent and wash the cuffs, front body, back body and collar one by one. The heavily polluted parts should be scrubbed. 4. Brush dry and put it in a ventilated place. The clothes can be put away when they are dry.