To eliminate foul odors from smelly household drains, start by pouring a large pitcher of water down every drain to ensure the interior P-traps are fully replenished with a water barrier that blocks sewer gases. Next, pour half a cup of baking soda followed by one cup of warm white vinegar down the pipe, let the fizzing reaction sit for 30 minutes to break down organic slime and biofilm, and flush the line thoroughly with a kettle of boiling water. Verification: Inspect the drain opening after flushing to confirm that all sulfur odors have completely vanished.
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