How to clean your dishwasher: ~Pull out the bottom rack and search the bottom and drain area for debris and clogs. ~Place a measuring cup full of plain white vinegar upright on the top rack, and run the dishwasher on the hottest setting. (The rest of the dishwasher should be empty.) ~Sprinkle 1 cup of baking soda around the bottom, plus some bleach if mold or mildew are a problem. Run a short, complete cycle with the hottest water.