Might be just some gunk built up in the trap…I solve this by pouring a cup of bleach diluted with a cup of water in…letting it sit awhile and then flushing a couple gallons of water down it. After that a half cup of baking soda down the drain and a little water to make it wet…let it sit a couple hours and flush again.

If it's the water coming out of the tap that stinks then you'll need to sanitize the fresh water tank…you should have instructions for this in your manual but essentially it involves using the winterization hose and the water pump to pump some diluted bleach from a bucket into the fresh water tank then filling the tank. Let it sit overnight and then run enough water through each tap to smell the chlorine. Then dump fresh water, flush, and refill.

JackKim wrote:

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Our pipe from our first sink goes sideways to hook into the 2nd sink pipe before draining down. So consequently stuff built up in the sideways pipe. Hubby took it all apart and we cleaned them out (and it was gross) and all has been well since.

And one more for us is when the galley is open to the sewer which we do sometimes cause it fills the fastest, allows for some smell to come through a little bit.

Warmly, Kim

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 Yeah…ours does too…the smaller right hand sink drains over to the main drain under the larger left one. I don't think they put in enough slope on the crossover pipe and it doesn't have a trap like the main one does so it fills up with gunk and smells. A little bleach and then some baking soda does the trick, I'll have to dig out my pipe snake and see if it needs some cleaning out as well.