Qualkem Box of 10 1 Litre 40 Shot Dish N Treat. A unique high-quality Washing-up Liquid & Grey Waste Tank cleaner in one using only a 25ml dose. This concentrate with easy use measure is hand safe with a pleasant Citrus fragrance. Reduces deposits and grease contamination in your waste pipes and tank and proactively cleans your waste water holding tank via your washing up water. It also can also be used directly via the plug hole of your kitchen or bathroom sink, or shower, to proactively treat & freshen pipes and tank.