This Nu-Calgon 4291-08 Nu-Brite condenser coil cleaner delivers the cleaning power you need to thoroughly clean and brighten dirty condenser coils! This product boasts a high-foaming formula made with the best possible detergents and chelants. This allows it to cut through even tough grease and grime, and to lift dirt up out of condenser coils to be rinsed away. And since it's alkaline-based it's much safer and cleans better than more dangerous acid-based cleaners, too. Use it to clean and brighten air-cooled condensers and other finned heating and cooling coils. It is not for use indoors, or on evaporator, coated fin, or micro-channel coils. The 1 gallon bottle makes it convenient to apply on affected areas, once diluted to the correct ratio.