Foul odors in kitchen pipes and sinks are caused by bacterial growth in the damp, dark pipelines. To keep them fresh and odor-free, use something natural and safe enough for drainpipes yet strong enough to get rid of the odor as well as the bacteria. Use a cleaning solution once or twice a month to keep your pipes clean and odor-free.
Pour a pot of boiling water down the drain to loosen odor-causing residue.
Pour 1 cup of baking soda into the drain opening and follow quickly with 1 cup of white vinegar. The ingredients form a reaction that cleans the drainpipe's walls, kills bacteria and eliminates odor. Let the foam move down the drain for an hour.
Pour another pot of boiling water down the drain to flush away all of the lifted residue.