How do I get rid of a sulfur smell coming from the bathroom sink overflow drain?

The smell is definately coming from the overflow. We checked the water and the drain pipes. If we plug the overflow the smell stops. The odd thing is that the smell will go away after a while but will come back after we clean the sink with any sort of cleaning products.
I dont know what caused the smell. We have checked the trap and cleaned it out but the smell still wont go away.

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