I tried supermarket own brand toilet gel - and the winner is just as good as Harpic or Duck and a third of the price | The Sun
Harpic Active Fresh Toilet Cleaner Gel l Removes Limescale & Stains l Scent: Mountain Pine l Size: Pack of 12 : Amazon.co.uk: Grocery
Harpic Toilet Cleaner Lavender (450ml x 12) - NeatStore.NG
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Harpic Disinfectant Toilet Cleaner Liquid, Original - 500 ml | Thick Toilet Cleaning Acid Suitable for Toilet Bowls : Amazon.in: Health & Personal Care