The Nu-Calgon 4166-08 Evap-Fresh No-Rinse 1-Gallon is a ready-to-use evaporator coil cleaner designed to clean and deodorize HVAC evaporator coils without requiring rinsing. It works by applying a foaming cleaning solution that loosens dirt, grease, and organic buildup from coil surfaces, allowing contaminants to drain away naturally. Suitable for air conditioners, heat pumps, and air... https://www.partshnc.com/4166-08-nu-calgon-evap-fresh-gallon