Give hats a clean new look by brushing with a dry Resistol Felt Hat cleaning sponge. By shaving off loose nap, lint, and surface soils you are able to keep your felt hat in great condition. Brush from front to back of hat with the nap and in the same direction on the brim. Sponges can be used with specially formulated Resistol cleaning agents. Use one sponge for light colors, and one for dark. Clean sponges with warm water.