Park Tool CB-4 Bio Chain Brite
Park Tool Bio ChainBrite™ Bicycle Chain and Component Cleaning Fluid is a 100% biodegradable, natural, plant-based degreaser formulated for use in your favorite chain scrubber or as a general purpose degreaser. Won't 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