Prestone Yellow AS105 Radiator Flush and Cleaner-22 oz, 22. Fluid_Ounces 2-in-1 formula designed for light flushing and heavy-duty cleaning Cleans cooling systems to help prevent overheating Non-toxic, non-acidic formula is easy-to-use and safe for all cooling system metals Effectively removes heavy deposits by drawing metal oxides into the solution Strong enough to help restore maximum cooling system efficiency