Fill a bucket with 1 quart of warm water and 1 cup of white vinegar.
Dip a sponge or dish cloth in the water.
Scrub the sides of the dishwasher to remove built up film. Rinse the sponge, then dip in the vinegar mixture again and scrub the arms of the dishwasher, located along the bottom under the racks.
Run a complete cycle with a bowl filled with vinegar placed in the bottom rack. Do not use soap or any other substances during the cycle.