The morgan blue chain cleaner is an active drive train cleaner degreaser used by several professional teams the product complies with the highest environmental standards apply the chain cleaner on the chain front and rear derailleur chain rings and rear cassette for a clean and smooth running bike use a chain brush for best results as this will keep the quantity of cleaner used to a minimum yet help dislodge dirt in areas like the rear cassette coming supplied with a handy pump applicator