I noticed a couple of weeks ago a smell under my kitchen sink. When I took everything out, I saw mold on the wall. I also noticed a small leak from the dishwasher to the sink. Repaired everything and cleaned up. Let dry out for a couple of days. When I run the dishwasher, I notice steam in the cabinet underneath the sink and this is causing the smell again. How do I deal with this?

You have a leak. Possibilities: drain hose, hot water supply hose and dishwasher gasket (least likely). Take everything out of the cabinet. Line bottom with newspaper and cover with a layer of paper towels. Look for a leak. Water leaks can be very difficult to find, meaning don't expect to draw a vertical line from the spot and locate the leak. That just happens to be th lowest spot from where it drips.