Keep your chain in the best possible condition with the RNX Chain Scrubber. The RNX Chain Scrubber can be used on bike chains without removing your chain from your bike. You can clean your bike easily at your home or garage. Just attach the RNX Chain Scrubber to the chain, fill the container with a cleaning solution (not included), and rotate the pedals to pass the chain through the internal brushes. The brushes scrub the chain, removing dirt, grime, and other debris that can accumulate on your chain over time. Only takes minutes but helps improve the longevity and reliability of your bicycles drivetrain.