Pouring boiling water down a drain should be done carefully, typically 2 to 3 times with a few minutes of waiting in between, but only if you have metal pipes. Boiling water helps melt soap scum and grease buildup. However, Callout type="warning" title="Hygiene Warning": Never pour boiling water down PVC plastic drainpipes, as excessive heat can soften PVC joints, warp pipe fittings, and ruin the adhesive seals, causing severe under-sink leaks. Verification: Check your pipe material before pouring hot water to ensure it is metal rather than plastic.
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