The park tool bio chainbritetrade bicycle chain and component cleaning fluid is a 100 biodegradable natural plant based degreaser formulated for use in the cm 52 cyclone chain scrubber or as a general purpose degreaser won39t harm alloy plastic or rubber parts use cb 4 full strength do not dilute with water cover parts in solvent and scrub using a brush 16 oz bottle park tool bio chainbrite features cb 4 bio chainbrite is a 100 biodegradable natural plant based