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👉 Check Latest PricePark Tool CB-4 is a 100% biodegradable, plant-based degreaser designed to keep your drivetrain and components spotless. Use it with the CM-5.3 or CM-25 Cyclone Chain Scrubbers, or with a brush for general cleaning. CB-4 penetrates deep to remove dirt, grime, and grease from chains, cassettes, chainrings, pulleys, and other components—leaving them clean and running smoothly. Safe on alloy, plastic, rubber, and carbon fibre, it’s an environmentally friendly way to maintain your bike without harming the finish or performance of your parts. Key FeaturesCB-4 Bio ChainBrite is a 100% biodegradable, natural, plant-based degreaserIt removes the toughest grease and grime build-up from chains and bicycle componentsBio ChainBrite also doubles up as an excellent general-purpose bicycle degreaserRegular use of Citrus ChainBrite, chain bath, and a quality chain lubricant reduces gear system wear and friction for smoother, quicker shifting