Pro-Blue™ is a heavy foaming alkaline-based solution designed for condensers, microchannels, and mini-splits that penetrates dirt and grease removing deposits resulting in clean and brightened coils. Pro-Blue is biodegradable, NSF approved, and available in numerous packaging configurations. Diversitech Pro-Blue™ Coil Cleaner, Foaming Concentrate, 1 gal, Liquid, Odorless, Composition: Water, Sodium Hydroxide, Sodium Carbonate, Sodium Gluconate, 1.19 Specific Gravity, Blue