Pouring boiling water down a shower drain can help melt and flush away minor soap scum and grease buildup, but it is generally ineffective against solid hair clogs, which make up the vast majority of shower blockages. Furthermore, Callout type="warning" title="Hygiene Warning": Never pour boiling water down PVC plastic drainpipes, as extreme thermal shock can soften PVC joints, warp pipe fittings, and destroy adhesive seals, causing severe under-sink leaks. Verification: Check your pipe material before pouring hot water to ensure your plumbing system is metal.
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