MOTUL RADIATOR CLEAN effectively removes deposits from the cooling system equipment. The contaminants are then drained with the old cooling fluid. Recommended for use in any closed cooling system of passenger cars, commercial vehicles, and industrial heat exchangers. Improves the performance of valves, thermostats and water pumps. Effectively removes deposits from the cooling system equipment. The contaminants are then drained with the old cooling fluid. Recommended for use in any closed cooling system of vehicles & industrial heat exchangers. TYPE OF USE: Add MOTUL RADIATOR CLEAN to the cooling system before each coolant drain. Move all heater controls to ?hot? position. Let the engine idle for approximately 30 minutes. Drain the system completely and flush with clean water. Refill the cooling system with new coolant according to the manufacturer?s instructions.; Attention: Open radiator filling cap slowly - system under pressure - risk of getting burn. 300ml is sufficient for cooling systems of 10L capacity.; Do not exceed the recommended proportion. If necessary, proceed with 2 successive treatments.