We tested all the non rinsing evaporator coil cleaners and found them to be marginally successful. The main reason for their lack of luster was the low temperature conditions. Common detergents just don't work well in cold water environments.
E+ uses Enzymes, which have proven to be the most productive cleaning agents in cold water. The Enzyme detergent action is impressive. Tobacco, cooking greases and water resistant soils are thoroughly remove from the coil. Enzymes have one draw back...they are very slow acting. When you apply E+ to the coil do not expect much in the way of instant cleaning. Check the coil after a couple hours or days and you will discover there is actually nice looking metal beneath which once was "blackened" heavily tarnished fins.
Best of all, E+ is a very safe cleaning compound to handle in every respect: Non Toxic, No Odor, Neutral pH, Biodegradable and friendly to all metals.