- The Muc-OffBicycle chain Brushis an essential tool for keeping your bikes' chain and whole drivetrain spotlessly clean and running smooth. The multi-faceted, ergonomically shaped brush is designed to clean 3 sides of the chain at any one time, the bristles penetrate deep between links and rollers for a deeper clean, which all help to keep your chain in optimum condition for longer. The longer bristles on the end can be used to clean other drivetrain components; chainrings, cassettes and jockey wheels.