The Muc-Off Bio Drivetrain Cleaner is a complete drivetrain cleaning solution that can be poured into a chain cleaning device or sprayed directly onto chain rings, rear cassettes, and derailleurs to clean your entire drivetrain in seconds. It is fully biodegradable* and safe for metal, plastic, rubber, and seals, offering unparalleled cleaning results. For an even deeper clean on the dirtiest chains, try using the Bio Drivetrain Cleaner with the Muc-Off X-3 Dirty Chain Machine. This 750ml refill bottle does not include a trigger. *Only contents are biodegradable. Key Features: Biodegradable* Fast and effective grease-cutting formula. Removes all chain oil and wax residue. Safely eliminates drive chain contaminants. Ideal for use with chain cleaning devices. Deep cleans all drive chain areas in seconds. *Only contents are biodegradable.