Dishwasher Not Cleaning Dishes Properly?
Updated June 2026 · 5 of these 6 fixes are free
Before calling a tech, try these three free fixes: (1) clean the drain filter, (2) clear the spray arm holes with a toothpick, and (3) run the hot water at your sink for 30 seconds before starting the dishwasher. These solve the problem 80% of the time. Florida's hard water makes spray arm clogs especially common.
6 Causes (Most Are Free Fixes)
1. Clogged Spray Arm Holes
The spray arms (top and bottom) have tiny holes that shoot pressurized water at your dishes. Florida's hard water deposits calcium and mineral buildup in these holes, reducing spray pressure. Fix: Remove the spray arms (they usually twist or unclip). Soak them in white vinegar for 30 minutes. Use a toothpick to clear each spray hole. Rinse and reinstall. Do this every 3—6 months.
2. Dirty Drain Filter
A clogged filter means dirty water is being recirculated over your dishes instead of draining away. This is also the #1 cause of dishwashers not draining. Fix: Remove the filter at the bottom of the tub, rinse it under hot water, scrub with a soft brush, and reinstall. Clean monthly.
3. Water Not Hot Enough
Dishwashers need 120°F water to dissolve detergent and cut grease effectively. If your water heater is set too low, or the dishwasher is far from the heater, lukewarm water enters the dishwasher. Fix: Run the kitchen faucet on hot for 30 seconds before starting the dishwasher. This purges the cold water from the line so the dishwasher fills with hot water immediately. Also verify your water heater is set to 120°F.
4. Wrong Detergent or Dosage
Best choice: Detergent pods or tablets. They're pre-measured and contain rinse aid. Worst choice: Liquid gel, especially in hard water areas like the Treasure Coast. Gel detergent doesn't dissolve mineral deposits well and leaves a film on dishes. If you use powder, don't overfill the dispenser — more detergent doesn't mean cleaner dishes. It means more residue. Also: use rinse aid. It prevents water spots and helps dishes dry.
5. Overloading or Bad Loading
The spray arms need clear paths to reach every dish. Blocking them with a large pot or cookie sheet creates a "shadow zone" where nothing gets clean. Common mistakes: nesting bowls (water can't reach the inner bowl), placing tall items in front of the detergent dispenser (the door can't open mid-cycle), laying utensils flat (they should stand upright in the basket), and packing too tightly.
6. Failed Wash Motor or Circulation Pump
If you've cleaned the spray arms, filter, and adjusted detergent but dishes are still dirty, the wash motor or circulation pump may be failing. Signs: the dishwasher sounds quieter than it used to (less water pressure), or you hear grinding/humming. The pump moves water through the spray arms under pressure — when it weakens, cleaning performance drops dramatically. Cost: $200—$400.
Once a month, run an empty dishwasher on the hottest cycle with 2 cups of white vinegar in a dishwasher-safe bowl on the top rack. This dissolves mineral buildup, clears grease from the interior, and keeps the spray arms and filter clean. For heavy hard water buildup (common across Port St. Lucie and Stuart), use a dishwasher cleaning tablet like Affresh or Finish once a month instead.
Tried Everything and Dishes Are Still Dirty?
$109 diagnostic. We test water pressure, pump operation, and heating element. Same-day available.
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