Why citric acid? It dissolves the "drain slime" (biofilm) that standard soap leaves behind. It also neutralizes the rotten-egg smell permanently.

You’ve tried the vinegar washes. You’ve scrubbed the filter. Yet, that murky, swampy smell still wafts out every time you open the door. The problem isn’t on the surface—it’s trapped deep in the drain assembly .

: Locate the filter assembly at the bottom center or back corner of the tub. Most modern units have a cylindrical filter that unlocks with a quarter-turn counterclockwise.

Empty the dishwasher