Park Tool GSC-1C chain and freewheel cleaning brush

With its unique design, the Park Tool cleaning brush provides quick but effective cleaning for those on a budget. With its large handle, curved head and long saw teeth, the brush allows you to clean thoroughly between the freewheel sprockets. Combined with a degreasing fluid, the sturdy nylon brush can be used to clean the chain, derailleur or any other part of your bicycle.
So you'll have no more excuses for having a dirty drivetrain