To eliminate foul sewer gas odors emanating from a sink drain or garbage disposal, you can pour a mixture of baking soda and white vinegar followed by hot water. Pour half a cup of baking soda down the drain, chase it with one cup of white vinegar, and let the mixture fizz for 15 minutes to break down organic buildup. If the sewer smell stems from a dried-out plumbing P-trap allowing sewer gases to bypass the liquid seal, pour a large pitcher of water directly into the drain. Verification: Check that the foul odor disappears and run water to ensure the P-trap maintains its liquid barrier.
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