Kitchen sink

Has anyone had this problem before? There is a musty smell coming from my kitchen sink drain. What can I use to get rid of it and what can cause this problem? Thanks.

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You might have some food particle stuck in the drain trap or the caulking is rotten with mold, I would try to snake down the drain or use chemical drop cleaner and see if it helps.

I am going to try pouring bleach down the drain. I checked underneath the sink and there is no leaking. Thanks for the tip.