Harpic toilet cleaner kills germs germs and removes stains and limescale. The improved formula leaves a longer lasting fragrance in your toilet and gives you maximum coverage in the bowl. HOW TO USE1. 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.