Product Description Bleach only whitens limescale but cannot remove it. Harpic 100% Limescale Remover is 5X better* than bleach on powering through limescale. Directions Usage Instructions & Directions. 1. Lift up the toilet seat and carefully direct the nozzle under the toilet rim. 2. Squeeze and apply slowly all around the bowl, allowing enough liquid to cover the bowl completely. 3. For best results leave for 10 minutes then brush and flush. 4. For killing all germs leave for 1 hour then brush and flush. Suitable for all toilet bowls except stainless steel. Use biocides safely. Always read the label and product information before use. CORROSIVE. Precautions. Causes severe burns. Contains hydrochloric acid. Keep locked up and out of the reach of children. Avoid contact with skin and eyes. Keep away from food, drink and animal feeding stuffs. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable protection clothing, gloves and eye/face protection. In case of accident or if you feel unwell seek medical advice immediately (show the label where possible). Do not mix with bleach or other cleaning products. If swallowed, rinse mouth with water (only if the person is conscious). After contact with skin, wash immediately with plenty of water. This product and its container must be disposed of in a safe way. Do not allow to come into contact with any surface other than the toilet bowl. See more. *Tested by independent research institute. Ingredients 100g of Liquid contains 6.75g Hydrochloric Acid <5% Non-Ionic Surfactants <5% Cationic Surfactants, Disinfectant, Perfume.