Yes, it is entirely safe and highly recommended to leave white vinegar in your toilet bowl or tank overnight to dissolve hard water mineral deposits, calcium scale, and stubborn rings. Because vinegar is a mild acetic acid, letting it sit for 8 to 12 hours breaks down mineral crust without damaging porcelain ceramic, rubber flappers, or plastic flush mechanisms like harsh chemical cleaners do. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when scrubbing the bowl after soaking. Verification: Scrub the loosened mineral scale with a toilet brush and flush the bowl clean.
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