The 18 oz.
And since it's alkaline-based it's much safer and cleans better than more dangerous acid-based cleaners. Aerosol Condenser Coil Cleaner After the equipment is turned off spray the solution onto dirty condenser coils and allow it to remain in contact for 5 - 10 minutes. aerosol condenser coil cleaner delivers the cleaning power you need to thoroughly clean and brighten dirty condenser coils! It is not for use indoors or on evaporator coated fin or micro-channel coils. After thoroughly rinse with water and apply a coil protectant like CalShield sold separately.