Open your dishwasher and remove any food particles or debris that may be inside. These particles often collect at the bottom of the washer, near the drain.
Spray the inside surfaces and seals of your dishwasher with white vinegar. Wait for 30 minutes as the vinegar soaks in.
Wet a cleaning sponge with white vinegar and dip it into baking soda. Use the sponge to wipe out the inside of the appliance and the washer's seals.
Moisten a clean toothbrush with white vinegar and dip it into baking soda. Use this brush to reach small areas that you may not have been able to clean well with the sponge.
Fill a dishwasher-safe container with white vinegar and place it upright and uncovered on the top rack of your washer. Run the washer through its regular cycle.