Coil Safe is a Premium External neutral pH Evaporator Coil Cleaner intended to be used 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, body oil, dust mite and grease, the cooling action and efficiency of coils is greatly enhanced. Safe to use on aluminum and copper.