Nu-Calgon 4171-75 Evap Foam No Rinse Evaporator Coil Cleaner, 18 oz.

Evap Foam will liquefy dirt, grease, oil, and other residues quickly and easily
Since it is fortified with corrosion inhibitors, it is safe for use on metals and other materials
The product’s fast-breaking foam is completely self-rinsing

Amazon.com Price:  $12.74 (as of 27/11/2022 09:46 PST- Details)