CB-2 Citrus ChainBrite(r) is specially formulated for use in the Park Tool CM-5 Cyclone Chain Scrubber(r). It removes the toughest grease and grime buildup from chains and bicycle components. Citrus ChainBrite(r) is also an excellent general purpose bicycle degreaser. Regular use of Citrus ChainBrite(r); and the CM-5 (along with regular use of a quality chain lubricant) will reduce gear system wear and friction and promote smoother, quicker shifting. A handy flip-top lid on the 16 oz. (474ml) bottle makes spill free pouring easy. CB-2 is 100% biodegradable and has a fresh citrus smell.