Grunge Brush Chain & Gear Cleaning Tool: Chain and gear cleaning has never been faster or easier! Scrub the chain with the compact bristles of The Grunge Brush to clean all four sides of a chain. Use the long bristled end to clean other components like sprockets, derailleurs, crankset, brakes and pedals. Can be used wet with a degreaser Regular component cleaning prevents premature wear and tear on chain and sprockets, eliminates chain skipping caused by dirt and grunge, and assures smooth operation of drive train and brakes.