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I think the smell is actually coming from the other drain on the left hand side. I could be wrong though. I am going to give it a bit and see if my wife thinks it is better. We do not put salt in the dishwasher. I think a lot of that gunk is from before we moved into the house because we do a pretty good job of rinsing our dishes before we put them in the dishwasher.

Understood. We have a water pump in the cellar and sometimes it can smell there when the water seal dries up.

Our trailer gets like that since we don't use it all the time in the summer.