Oust All Purpose Descaler 500ml Oust All-Purpose Descaler is designed to remove up to 100% of limescale* from common household appliances. The active citric acid works to lift and remove tough limescale to keep your equipment clean and working at its best. Application varies depending on the appliance; either mix with cold water, hot water or apply directly. Suitable for coffee machines, fully automatic coffee machines, water kettles, water boilers, taps and surfaces. *typical domestic...