Detergent for Air Conditioning Equipment Surfactants & Detergents. A revolutionary "no rinse" product formulated specifically for indoor cleaning of evaporator coils. It is metal safe and will not harm the metal of the coils. The ECO-CLEAN is very good for light to moderate cleaning jobs, and it is ideal for seasonal coil treatment to prevent future contamination of the coils. ECO-CLEAN is highly concentrated. Use ratio 3 to 6 parts water to 1 part of ECO-CLEAN ECO-CLEAN concentrate is a Non Acid coil cleaner. It is manufactured to be strong enough to emulsify and remove contamination from heat transfer surfaces. The key to the use of ECO-CLEAN «no rinse " cleaner is to apply it to the upstream (intake) side of the coil with the air-flow on whenever possible. This method of application causes the chemical to mix with the air on its normal turbulent pass through the coil thereby wetting with chemical all heat transfer surfaces exposed to the airflow.