We have a smell that only comes from the kitchen sink sometimes.
I have tried cleaning it all different ways many times. Have taken the plumbing apart by the Ptrap and have done the baking soda thing all different ways.
We put in a new dishwasher a few months back and the smell subsided. It is now back but only sometimes from the sink, which makes it go to dishwasher also.
When dishwasher was installed the guys were told of the problem so I am sure my plumbing is right.
I also had a friend look at it and he told me it looked good. He is a plumber.
Can it be something behind the walls that I would have no clue about?
Best Answer
I would look at the garbage disposer. In the bottom chamber that is connected to the drain pipe. I would remove the drain pipe at the disposal. If possible look through the opening and see if grind up food and grease has formed a 'paste' on the inter-wall. Fibrous vegetables can also form large gobs of waste matter after passing through the grinder. Water is able to pass through, but the decaying waste on the wall is nearly impossible to flush out. Unplug the disposer. Use a long thin stick, drain brush, or other items to scrape the rotten mess out of the chamber.
Reconnect the drain pipe, and flush with hot water several minutes.