Prestone Cooling System Flush contains powerful cleaning and anti-limescale agents that remove grime, deposits, and contaminants from the cooling system. It circulates through the cooling system after old coolant/antifreeze has been drained, lifting deposits, and helping to protect components such as gaskets and hoses.
Cooling System Flush is designed to be used in place of water when flushing the cooling system. So, you drain the coolant/antifreeze, add Cooling System Flush, and run the engine for a few minutes to allow the product to circulate through the system, cleaning as it goes.
After that, it’s just a matter of draining the product from the system and topping up with fresh Prestone Coolant/Antifreeze, which will protect the engine from extreme temperatures for up to 10 years, or 300,000 miles.