Park GSC-1 Gear Cleaning Brush - Bike Specific Cleaning Tool
Park Tool's patented 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. Handy size to take along for quick cleaning anywhere. Made of sturdy nylon.
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What a great tool! I cant believe I've been riding for a decade and this is the first time I've had this tool. Gets into the tough spots on my 10 sp. cassette. The bristles will be worn out after 1 season.
If you've got a cruddy, grungy, disgusting bunch of gears, then this thing, coupled with some degreaser, is one of the best ways to go. Unless you have a parts washer of course! The teeth on the back of the handle break up and pull out the dried-on gunk pretty well, but you do have to wipe it off pretty often. The brush is okay at best. It's good for light scrubbing, but it gets mangled and messed up pretty quickly.