Muc-Off's Bio Drive Train Cleaner is the solution for all dirty, sticky, and grimy drivetrain components. It is simply sprayed onto the chain, derailleur, sprockets, and shifters. After that, let the drivetrain cleaner sit for 3-5 minutes. For stubborn dirt, it is best to use the Detailing and Claw Brush, and then simply rinse off. It is biodegradable and therefore safe for the environment. It can be used in combination with the X3 Chain Cleaning Device by filling the designated reservoir with the drivetrain cleaner. Important: No spray nozzle is included.