Caustic Soda flakes used for: Removing organic matter, edible fat from floors, cookers, hoods, barbecue grills, grills and ovens (dissolve 200/500 g in 3-4 litres of water and soak for 6-8 hours); Removing oil paint when restoring wood (dissolve 300/500 g in one litre of water and soak or apply with a brush); Cleaning drains blocked by scale residues, food, cooking fat, hair etc. (pour about 150/200 g directly into the drain and add 1-2 litres of hot water). The product does not attack any metals except for aluminium, magnesium and zinc, and their alloys.