How to Clean a Dishwasher: Deep Clean, Filter, and Spray Arm Maintenance

Cleaning a dishwasher removes grease, food residue, mineral deposits, and odor-causing bacteria. Monthly cleaning prevents most dishwasher performance issues (not cleaning, smells, cloudy glasses). Step 1: Remove and clean the filter. Pull out the filter assembly from the bottom of the tub (twist-lock on most models). Rinse under running water, scrub with a soft brush. This is the single most impactful dishwasher maintenance step - a clogged filter recirculates dirty water onto clean dishes. Step 2: Clean the spray arms. Remove upper and lower spray arms (usually twist off or pull up). Use a toothpick to clear each spray nozzle hole of mineral deposits. Step 3: Run a cleaning cycle. Place a cup of white vinegar in a dishwasher-safe cup on the top rack. Run the hottest cycle empty. Step 4: Sprinkle 1 cup of baking soda on the bottom and run a short hot cycle. This deodorizes. Step 5: Wipe the door edges and gasket with vinegar - these areas don't get washed during cycles.