ComStar's Coil Safe is a Premium External neutral pH evaporator coil cleaner intended for indoors. Coil Safe will restore heat transferring qualities to 100% efficiency by removing lint, dust, dirt, and grease build-up on the aluminum fins without requiring any rinsing with water. Coil Safe is a non-foaming super concentrate that can be diluted with 3 to 10 parts water, depending on the level of cleaning required. Coil Safe cleans and brightens all metal parts and contains inhibitors to prevent metal fatigue. Coil Safe is a traditional green color, non-acid, non-alkaline, neutral pH, and environmentally safe formula! By keeping coils clean from dirt, natural body oil, dust mite, grease, the cooling action and efficiency of coils are greatly enhanced. Safe to use on aluminum and copper.