Yes, you can safely let white vinegar sit in your drain overnight without risking any damage to your PVC plastic or metal plumbing pipes. Because vinegar is a mild acetic acid, allowing it to remain in the P-trap for several hours or overnight provides extended contact time to help dissolve hard water mineral scale, neutralize foul organic odors, and break down light soap scum films clinging to the interior pipe walls. Verification: Flush the drain thoroughly with a kettle of hot tap water the following morning to wash away the loosened debris.
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