::
It could be two things. One is an inherent smell based on installation issues. You need to make sure the drain under the sink is looped high, or stale dishwasher water will always siphon back down the line. This is a very common problem that solves bad odor all the time. If the drain is installed correctly, then run a few Afresh dishwasher cleaning tablets twice a month. That will take the odor away and keep it from coming back as well.