5 x unpackaged Kettle Scrubs! Simply drop a Kettle Scrub into your kettle and let it fizz in the water to help irritate the limescale build up. After 1 hour discard of the water in the kettle, along with any limescale residue. Be sure to fill the kettle with water and reboil. Repeat by refilling & reboiling once more before using the kettle! Do not mix with other cleaners Keep out of reach of children & animals Always be careful when using hot water (Citric Acid) DO NOT MIX WITH OTHER PRODUCTS. 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. Continue rinsing. If eye irritation persists: Get medical advice/attention.