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
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Toilet Active Oxygen Agent, Touch Free Fizzy Foam Toilet Cleaner, Splash Toilet Cleaner Foaming Powder, Easy To Help You Solve In Toilet Cleaning, No Peculiar Smell (1PC) : Amazon.co.uk: Grocery
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Do automatic toilet cleaning gels work? : r/CleaningTips