The inside of a dishwasher is the ideal environment for mold. It’s moist; it’s dark; and it’s warm. The best way to get rid of mold in a dishwasher is to put a cup of white vinegar in a cup or bowl on the top rack of your dishwasher. Then run the empty dishwasher on the hot cycle. White (clear) vinegar is a great household cleaning product, although most people just use vinegar to make salad dressing. To prevent mold from reappearing in your dishwasher, leave the door of your dishwasher open for an hour or two after you finish washing a load. This will dry out the inside of the dishwasher as well as dry off your dishes. Never put bleach in a dishwasher. You could damage your dishes as well as the machinery and besides, bleach is toxic and should never be used in places where it will come into contact with your dishes or cookware.