Use CB-4 full strength, do not dilute with water. Cover parts in solvent and scrub using a brush.
Parktool Bio ChainBrite™
Bio ChainBrite™ Bicycle Chain and Component Cleaning Fluid is a 100% biodegradable, natural, plant-based degreaser formulated for use in the CM-5.3 Cyclone Chain Scrubber, CM-25 Professional Chain Scrubber, or as a general purpose degreaser. Will not harm alloy, plastic, rubber, or carbon fiber parts.