Mannol 7904 chain cleaner in aerosol form removes old lubricant, dirt, dust, sand and road contaminants from all types of drive chains including O-ring X-ring and W-ring models. formulated with powerful active solvents it penetrates every link and joint dissolving hardened residues of grease resin and varnish. it evaporates quickly and completely without damaging chain seals leaving the surface clean and ready for fresh lubrication. recommended for use before applying lubricant to ensure optimal chain life performance and protection. use by shaking the can spraying thoroughly then allowing approximately ten minutes for evaporation before applying a fresh lubricant.