Biokleen All Purpose Cleaner Super Concentrated (16 oz) is a triple-strength, natural, non-toxic cleaner powered by citrus extracts. It tackles tough grease and dirt on many surfaces, works in cold water, leaves no harsh fumes or residues, is biodegradable, safe for gray water/septic systems, and free from artificial fragrances, colors, preservatives, ammonia, chlorine, and other harsh chemicals.