Acidic Toilet & Washroom Cleaner \r\nBactericidal toilet and washroom cleaner. STC is used neat for descaling toilets and urinals or as a diluted solution for general washroom cleaning. The thick blue liquid contains safe sulphamic and citric acids to dissolve limescale and organics and remove grease, body oils and scum from surfaces. Ideal for cleaning toilets, urinals, showers and sinks, STC is safe for use on stainless steel. Ideal for example, washrooms, nursing homes, hospitals, offices.