Check the listing for details. Safe-X Acid-based Coil Cleaner - 5 gallon pail. Condition: New. Listed at 109.00 USD. A highly effective acid-based product for removing all deposits from the inside of air conditioning coils. Air-cooled condensers, evaporator coils and other finned cooling and heating coils can become coated and clogged with greasy dirt and grime. This contamination will in turn cause the coil to lose efficiency. Safe-X is a low-pH or acid-based product developed for cleaning evaporator coils, air-cooled condensers and other finned cooling and heating coils to help restore lost capacity and efficiency.pH 1.0 Use dilution: 6 - 32 oz/gal. A highly effective acid-based product for removing all deposits from the inside of air conditioning coils. A highly effective acid-based product for removing all deposits from the inside of air conditioning coils.