Vinegar can be an effective solution for cleaning toilet bowl stains, especially those caused by hard water or mineral deposits. Vinegar’s acidity helps to break down these deposits. To clean with vinegar, pour a generous amount into the toilet bowl and let it sit for several hours or overnight for tough stains. Then, scrub with a toilet brush and flush. You can combine vinegar with baking soda for more stubborn stains for an extra cleaning boost. However, vinegar may not be as effective on all types of stains, such as those from mould or mildew, where a more potent disinfectant might be necessary. Always use caution when mixing vinegar with other cleaning products, as it can react with certain chemicals, creating harmful fumes.