Moisture becomes trapped in the door gasket, but it’s not cleaned out during a regular wash cycle. Food particles, dirt and other debris become damp, then mold grows on it. … Clean the gasket out once weekly after you have run the dishwasher. If mold is an ongoing issue, you may need to dry the gasket after each use.

Why is there black stuff in my dishwasher?

The root cause of the slime and smell inside the dishwasher is food debris inside the unit. … The food particles attract mold and bacteria, which combine to make the bad smell. The combination of decomposing food and slick mold can look like black slime, although in some cases the color is closer to dark green or brown.

Can I run bleach through my dishwasher?

Pour 1 cup of bleach into a dishwasher-safe, bleach-safe bowl and place it on the top rack of your dishwasher. Then run a full cycle, but skip the drying cycle. Tip: Do not use bleach in a stainless steel dishwasher or a dishwasher that contains stainless steel parts, as bleach will damage it.