Simply drop one 'kettle scrub' into your kettle and let it fizz in the water to help irritate the limescale buildup. After an hour change and boil the water. Do this twice before using the kettle again before daily takes.
(Citric Acid) Do not mix with other cleaners. Please keep out of reach of children and animals. Always be careful when using hot water.
Warning - causes serious eye irritation. Keep out of reach of children. If in eyes - rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do so. Continue rinsing. If eye irritation persists seek medical advice/attention.