The basics Twister Spot Remover is specially designed to remove most stains from felt hats. The uses Removes finger marks, spotting rings and grease stains and more. The pro tip Apply a small amount of Twister Spot Remover into the stain with a dauber or sponge. Rub stain out with hat sponge. The bottom line This product is great for removing light stains from all of your felt items.