DUNNY-CLEAN, Advanced Concentrate Bio-Enzymatic Plus + Cleaner disinfectant. Kills bacteria & odours. Toilet Head Cleaning treatment – When used will assist with your Poop-ETA Bio-Enzymatic Microbe Eco-System Colony that is living inside your toilet system also holding tanks… Spray or pour Dunny-Clean evenly into your toilet head bowl allow soak time, using a toilet brush