Professional cleaner reveals secret hack to remove tough toilet stains - and all you need is a pumice stone | The Sun
Is this a hard water stain? How to clean this? I scrubbed the top part of the toilet clean but the bottom is hard due to lack of leverage. : r/CleaningTips
Hard Water Toilet Stains : r/CleaningTips
How to Remove Hard Water Stains From a Toilet | LoveToKnow