The Foaming Dark Hat Cleaner by Bickmore will clean most dark colored fur-felt hats.
Always follow the directions as specified on the bottle.Foaming Dark Hat Cleaner - assorted / misc Directions:Always check for colorfastness or appearance change in hidden area prior to usingShake can well and spray test on paper or cloth for 3-5 seconds until liquid spray is whiteSpray can in upright position 8"from surfaceWait till hat is dry to the touchOnce dry, brush area using a dark hat brush until hat is cleanedFor heavily soiled hats, additional applications may be needed Note: For dark colored fur-felt hats only.