To eliminate a foul sewer gas smell emanating from a household drain, start by pouring a full pitcher of water down the drain to ensure the P-trap water seal is fully replenished. Next, pour half a cup of baking soda followed by one cup of warm white vinegar down the pipe, let the solution fizz for 30 minutes to break down odor-causing organic biofilm, and flush the line thoroughly with a kettle of boiling water. Verification: Smell the drain opening after flushing to confirm that the sulfur odor has completely vanished.
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