Add two-thirds of the paper cups to the water, soak the woolen coat for 5 minutes, and then gently press it with your hands. At this time, dirty water came out. Rinse once if there is less dirty water, and 2-3 times if there is more dirty water. Then put it into a net bag, dehydrate for 3 minutes, and finally put it in a ventilated and cool place, and naturally dry it in the cool place.