Muc-Off Individual Claw Brush The Muc-Off Claw Brush's stiff, slimline brushes are made for scrubbing heavily soiled chainrings, chains, cassettes and gear mechs. Its integral scraper comb is perfect for unclogging mud from the rear cassette. Offers a choice of three brush heads so you can choose one that's most appropriate. Watch this brush used with Muc Off Drivetrain Cleaner.