NuBrite 4291-08 is an alkaline, non-acidic product for cleaning and brightening air cooled condensers. Its the No.1 Coil Cleaner in the HVACR industry. It is formulated with the best foaming detergents and chelating agents that quickly penetrate and dissolve greasy dirt and soot and foam directly from the coil. Safer alternative to acid. Formulated to remove greasy deposits, dirt, grime, oxide deposits, cooking grease, lint, cottonwood and bugs. Used to clean and purge air-cooled condensers and other external heating and cooling fin coils. An alkaline cleaner that does everything acid does without risk. NuBrite's state-of-the-art surfactants and detergents instantly penetrate and remove layers of oily dirt and corrosive deposits from the coil. The foaming action pushes these loose fragments out of hard-to-reach places and restores the machine to maximum efficiency. Not recommended for indoor use.