Bio ChainBrite™ Bicycle Chain and Component Cleaning Fluid is a 100% biodegradable, natural, plant-based degreaser formulated for use with Park's chain scrubbers, or as a general purpose degreaser. Will not harm alloy, plastic, rubber, or carbon fiber parts. Use CB-4 full strength, do not dilute with water. Cover parts in solvent and scrub using a brush. 16 ounce bottle.