Responding to this post because the drain hose was installed properly (ran high through cabinet wall and then back down to kitchen drain) but still had smelly dishwasher. Moved into a home with existing Samsung dishwasher (DMT400). Noticed bad smells after dry cycle. Took apart the filter unit at bottom of tub and found grayish beige chunky slime over many of the parts (this involved removing the lower spray arm, the filter cover, and a spinning disk). Cleaned it all and reassembled. The smell was better but still noticeable from the door. Took off a metal cover to the vent near the top inside of the door and found more of the same 'growth or residue' on the inside of the metal cover and plastic grate (it twists to release--the two screws just below are for removing the vent housing inside the door and don't need to be removed). I pushed down the black diaphragm to thoroughly clean the entire area. Hopefully this resolves the smell once and for all. Hard to know if previous owners had maintained and used the dishwasher appropriately to prevent this build up in the first place. However, had also seen posts about a black grime along the inner rubber seal and I have also seen this and cleaned it and seen it reappear within a couple months. Although disgusting, not sure it was the source of our smell.
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