Redkleen RX 400 ( Radiator Flush & Clean) is a non-acidic radiator and cooling system cleaner that effectively cleans in one simple 20-minute operation. Many similar products have to be left in the cooling system for several days, which creates the risk of the user either forgetting or extending the drain and flush time for reasons of convenience. The results can be detrimental and cause expensive, long-term damage to the cooling system and associated components.Redkleen RX 400 ( Radiator Flush & Clean) overcomes this potential risk as the whole cleaning process is completed in one simple operation.