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Starwax The Fabulous Citric Acid is ideal as a descaler for things like kettles and coffee machines. But it is versatile. Remove deposits from coffee or tea cups and rust from metal objects.
To descale a kettle: Only leave enough water in the kettle to cover the heating element and the calcified areas. Add a teaspoon of citric acid, turn on the kettle, then rinse.
Causes serious eye irritation. Keep out of the reach of children. Use protective clothing.