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How to keep a toilet bowl clean
Use a multi-surface chemical cleaner.
For best results, choose a cleaner that promises to both disinfect and cut through difficult stains on ceramic surfaces, such as mildew and hard water deposits. Spray or sprinkle the toilet bowl cleaner liberally around the interior of the bowl.
Focus on areas with especially heavy staining or mold buildup. You also have the option of treating your toilet with a homemade cleaner made from a combination of ingredients like vinegar, baking soda, borax or hydrogen peroxide.