Pouring boiling water down a drain is fine only if you have metal plumbing pipes, as it helps melt connealed soap scum and grease buildup. However, Callout type="warning" title="Hygiene Warning": Never pour boiling water down PVC plastic drainpipes or modern plastic P-traps, as extreme thermal shock can soften PVC joints, warp pipe fittings, and destroy adhesive seals, causing severe under-sink leaks and flooding. Verification: Check your pipe material before pouring boiling water to ensure your plumbing system is metal.
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