Muc-Off Disc Brake Cleaner. Muc-Offs Disc Brake Cleaner will improve braking performance by rapidly removing brake dust and oil as well as dirt and grime from all brake parts. Its unique formula has added conditioners that will rehydrate your disc brake pads to dramatically reduce that ear-wrenching brake squeal plus itll prolong the disc pad life and restore braking performance. Muc-Off Disc Brake Cleaner air-dries in a flash without leaving any residue and its perfectly safe on rubber plastic and carbon fiber.