Did you know WD-40 is a great toilet cleaner for hard water stains?-WD-40
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Amazon.com: 2 Pack Toilet Cleaner Hard Water Build up Remover with Ergonomic Handle, Toilet Bowl Stain Ring Remover, Pumice Stone Toilet Cleaner Tool Stain Remover for Toilet, Pool, Bathroom, Sink : Health
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Super Iron Out 7.6 oz. Automatic Toilet Bowl Cleaner (6-Pack) AT06B - The Home Depot
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Amazon.com: Scrubbing Bubbles Toilet Bowl Cleaner and Power Stain Destroyer, Removes Limescale, Hard Water, and Stains, Rainshower Scent, 24 oz : Health & Household
How to clean the brown stains in toilet? Have tried toilet cleaner + scrubbing and baking soda with vinegar to no avail : r/CleaningTips
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Automatic Toilet Bowl Cleaner Effervescent Tablet for Toilet Fast Remover Urine Stain Deodorant Yellow Dirt Toilet Cleaning Tool - AliExpress
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Cloralen® Toilet Bowl Cleaner with Bleach | Cloralen®
Cleaning: Mrs Hinch fans share £1 hack to rid 'brown stains' from toilet bowls | Express.co.uk