Prestone Cooling System Flush 1 Litre delivers a deep clean for your car’s cooling system, helping to remove harmful deposits and corrosion. It eliminates scale, corrosion, and oil contamination and is safe for all engines and cooling system components, including water-cooled petrol and diesel engines, antifreeze/coolants, metals, gaskets, hoses, and plastics. Use with Prestone Coolant/Antifreeze for a complete flush and fill solution and a 10-year guarantee. It’s designed to be used to flush the radiator, powering through dirt, rust, and grime to extend the life of internal parts within the cooling system. Unlike water, which is less effective at removing stubborn deposits and can contribute to limescale build-up, Prestone Cooling System Flush gets to work instantly, removing tough deposits and dirt from the cooling system to ensure maximum performance and efficiency. To use, ensure the engine is cool. Drain the system and dispose of it according to local regulations. Pour Prestone Cooling System Flush into the expansion tank, top up with water to the correct level, and run the engine at idle for 45-60 minutes. Drain the system, flush with water, and add Prestone coolant/antifreeze to the correct level. Check coolant level regularly and top up as necessary.