Smelly sink
I'm a DIYer. So if this happend to my sink.
I would remove the p trap.
You might not even need a wrench to do it. Inspect the trap and clean it out. I googled this and found Bill's possible cause to be a valid one. You can leave a cup of water on the sink and see if it evaporates....
My bathroom sink was very clogged and the water went down very slow.
I removed all the pipes under the sink to the wall. They were all clogged.
I cleared them all and my problem was fixed.
Good luck!
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