This product is specifically developed to clean all automotive cooling systems. It is a powerful acid free radiator cleaner with a dual purpose: first it removes scale and second to eliminate rust, deposits and oily residues. This cleaner has a high performance in combination with all types of coolants, including organic acid technology (OAT) coolants. It is also very effective when older cooling systems need to be cleansed. This product keeps dirt and particles in suspension whilst cleansing. Because it is acid free, It is also safe for rubber hoses, seals and all metals in the cooling system. It is also very effective in all closed-circuit cooling systems. To increase performance, first replace the old coolant with water, and then add apply this cleaner. Shake the bottle well and add this product to the cooling system via the expansion tank when part of the system circuit (two hoses: out and return), or directly into the radiator when a single hose overflow tank is fitted. Warm up the engine with the heater control in HOT position. Let the engine run idle for 10 minutes with the heater still in HOT position. Stop the engine and allow cool. Open the drain valve and empty the system. With the system still open, flush with water until it is clear, close the system and refill with the coolant. 1 Bottle of Radiator Clean of 300ml will be sufficient for cooling systems of 5 to 12 liters.