Harpic Toilet Cleaner Harpic Original is 5X Better than Cocktails and has been specifically designed to dissolve 100% of limescale and kill all germs in your toilet bowl. The unique formula gives you better bowl coverage as you can ensure your toilet is left thoroughly clean and disinfected. HOW TO USE 1. To remove cap: tightly squeeze pads on side of cap and unscrew. Replace cap tightly after use. Use undiluted. 2. Directly nozzle under the toilet bowl rim and squeeze bottle gently. Squeeze to apply. Leave for at least 30 minutes or overnight for heavy stains. ALways leave toilet seat in an upright position. Flush clean.