Pouring white distilled vinegar down a sink drain is a popular and safe maintenance practice because its mild acetic acid helps dissolve hard water mineral deposits, calcium crust, and light soap scum buildup clinging to the interior pipe walls. When paired with baking soda, the fizzing reaction provides gentle mechanical agitation to help loosen surface slime and neutralize foul organic drain odors without damaging PVC or metal pipes. Verification: Flush the drain with hot water 30 minutes after pouring vinegar to wash away loosened debris.
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