Easy to use mechanism simply clips over the chain with minimum effort. Heavy duty rotating brushes, rapidly remove heavy chain grime quickly and safely. Includes 400ml bio-degradable Chain Cleaner. Removes even the toughest grime including water proof grease and chain lube/wax residue. Brings your chain back to life in just 19 seconds!. Muc-Off high-performance Chain Cleaner is specifically formulated to remove heavy chain grime quickly and safely. The unique formula breaks down oil, grease and grime, leaving the chain contaminant free – it can be used on all chain types, including O-ring. For optimum results use with the Muc-Off 'Chain Doc' cleaning device for hassle-free chain maintenance.. The Chain Doc is also compatible with Muc-Off's dry PTFE Chain Lube (sold separately) for super-fast and mess-free lubrication..