Wynn's RADIATOR FLUSH is a concentrate to clean automotive cooling systems. Powerful acid free radiator cleaner. Dual action: 1. Removes scale. 2. Eliminates rust, deposits and oily residues. Excellent performance in all types of cooling liquid, including OAT coolant. Keeps dirt and particulates in suspension whilst cleaning. Safe for rubber hoses, seals and all metals in the cooling system. Extremely effective in all closed-circuit cooling systems. Restores the optimal operation of the controls within the cooling system.