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Park Tools GearClean Brush is perfect for cleaning the chain and derailleur. It also works a treat on your brakes and any other place where dirt accumulates. Read more..
Park Tool’s GSC-1 GearClean™ Brush has a unique design. A large comfortable handle with a curved, toothed-end reaches dirt deep between the gears, and tough nylon bristles clean the derailleur and chain. Saves wear and tear on your chain and freewheel. Works great on brakes or other places where dirt collects.