Cleaning felt or suede hats is a difficult task. The tip here is, don't overdo it! Be gentle with your hat! This sponge is easy to use and maintains the integrity of the felt or suede. Hat sponges are the best way to remove dirt or smudges from your brim. Directions: Use small circular motions on the affected area with the dry sponge to remove lint and dirt. Extra tip: Use one sponge for dark and another for light felt hats. It works great, even removing makeup smudges.