Why does under my kitchen sink smell?

I have a oder coming from under my kitchen sink. I can pinpoint the smell. It doesn’t smell like anything rotting but it’s a strong smell. I have clean everything out took all the chemicals out. No smell from the actual drain or garbage disposal. We have a dishwasher but I never used it but ran it just to clean it and the smell is still there. I also haven’t noticed any leaks. What could this smell be?

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