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Old 02-21-2021, 11:30 AM
maama maama is offline
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A plumber once told me to do this monthly in sinks and drains:

Flush sink with hot water and then add (OVER SINK) baking soda to about 32 oz of white vinegar. It creates a volcano! Leave for about 20 minutes and run hot water. I did it in my garbage disposal as well .. had to do it twice, but it did work.
Good luck