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Fix a dishwasher that leaves spots

We'll confirm the symptom, check rinse aid and spray arms, then address water hardness and loading—or tell you when to call a pro.

Troubleshooting · Home appliances
10–25 min
What you'll need
  • Rinse aid (if low or empty)
  • Toothpick or soft brush (for spray arm holes)
  • Dishwasher cleaner (optional, for hard water)
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Steps

Goal: Confirm the symptom, check rinse aid and spray arms, then address water hardness and loading.

Check rinse aid

Goal: Rule out empty or low rinse aid—a common cause of spots.

  • Open the dishwasher door and locate the rinse aid dispenser—usually in the door or on the tub wall. Confirm it is filled to the line.
  • Check the rinse aid dial or setting. Confirm it is set to release (often a number 1–5; higher releases more). If it was off or at minimum, increase it.
  • Good: Rinse aid is full and the setting releases it. Proceed to Spray arm path.
  • Bad: Empty or low—fill the dispenser and increase the setting. Run a cycle and check. If spots are gone, you are done. If not, proceed to spray arm check.

Spray arm path

Goal: Inspect and clean spray arms so water reaches all dishes.

  • Remove the lower and upper spray arms (twist or lift per your model). Look through the holes for food, scale, or debris.
  • Use a toothpick or soft brush to clear blocked holes. Rinse the arms under running water. Reinstall and confirm they spin freely when you turn them by hand.
  • Good: Holes are clear and arms spin. Proceed to Hard water and loading.
  • Bad: Arms do not spin even when clean—motor or pump issue. Call a technician.

Hard water and loading

Goal: Address water hardness, loading, and detergent.

  • Confirm dishes are spaced so water can reach them. Glasses and bowls should not nest; flatware should be mixed in the basket.
  • Check detergent amount—use the amount on the package. Confirm detergent is not expired or clumped.
  • Run hot water at the sink for a minute before starting a cycle. Dishwashers need water at 120°F (49°C) or higher.
  • If you have hard water, run an empty cycle with a dishwasher cleaner (citric acid or similar) per product instructions—typically monthly.
  • Good: Loading adjusted, detergent correct, and cleaner run if needed. Dishes should come out spot-free.
  • Bad: Spots persist after all steps—consider a water softener or call a technician.

When to get help

Call an appliance technician if:

  • The spray arms do not spin (motor or pump issue).
  • You have tried rinse aid, cleaned spray arms, and adjusted loading and spots persist with no improvement.
  • The dishwasher shows error codes you cannot resolve.

Routine spot fixes do not require disassembling the dishwasher.

Verification

  • Glasses and flatware come out spot-free and clear after a full cycle.
  • No cloudy film or streaks on dishes.
  • Rinse aid dispenser is full and set to release.
  • Spray arm holes are clear and arms spin freely.
  • Loading allows water to reach all surfaces.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify dishes come out with spots or film after a full cycle; rule out fill or start problems.
  2. Rinse aid Fill the rinse aid dispenser and confirm the setting releases rinse aid.
  3. Spray arms Remove, clean holes, and reinstall spray arms; confirm they spin freely.
  4. Loading and detergent Adjust loading to avoid overcrowding; confirm detergent amount and freshness.
  5. Hard water Run a dishwasher cleaner cycle; consider water softener if you have very hard water.
  6. Call a pro Spray arms do not spin, or repeated fixes do not resolve spots—call an appliance technician.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Dishwasher model and brand
  • Whether rinse aid was low or empty
  • Whether spray arm holes were clogged
  • Water hardness (if known)
  • Loading and detergent practices
  • Steps already tried

Do dishes come out with spots, streaks, or film?

Run a full wash cycle. Check glasses and flatware when the cycle finishes. Spots or film indicate a rinse or water-quality issue.

Run a full wash cycle with a normal load. When the cycle finishes, check glasses and flatware for spots, streaks, or a cloudy film. Good: spots or film present—rinse or water-quality fault. Bad: dishwasher does not run or fill—see fix-dishwasher-will-not-start or fix-dishwasher-will-not-fill.

Yes No

You can change your answer later.

Different problem — or no problem

You do not have this problem. If the dishwasher does not run or fill, see fix-dishwasher-will-not-start or fix-dishwasher-will-not-fill. If dishes are clean with no spots, no action needed.

Done

Is the rinse aid dispenser full and set to release?

Empty or low rinse aid is a common cause of spots. The dispenser should be filled and the setting should allow release.

Open the door and locate the rinse aid dispenser. Confirm it is filled to the line. Check the rinse aid dial or setting—it should be on (often 1–5; higher releases more). Good: full and set to release. Bad: empty or at minimum—fill and increase setting, then retest.

Yes No

You can change your answer later.

Fill rinse aid and retest

Fill the rinse aid dispenser to the line. Set the dial to release rinse aid. Run a cycle and check for spots. If spots are gone, you are done. If not, proceed to spray arm check.

Done

Are the spray arm holes clear and do the arms spin?

Clogged spray arms block water from reaching dishes. The arms must spin freely.

Remove the lower and upper spray arms. Clear holes with a toothpick or soft brush. Rinse and reinstall. Confirm they spin freely by hand. Clogged or stuck: clean and retest. Clear and spin: proceed to loading and hard water.

Yes No

You can change your answer later.

Clean spray arms and retest

Clear all holes in the spray arms. Rinse under running water. Reinstall and confirm they spin. Run a cycle. If spots are gone, you are done. If not, check loading and hard water.

Done

Is loading correct and do you have hard water?

Overcrowding blocks spray. Hard water causes mineral spots. Both are adjustable.

Confirm dishes are spaced—no nesting. Check detergent amount and freshness. If you have hard water, run a dishwasher cleaner cycle per product instructions. Good: loading adjusted and cleaner run if needed. Bad: spray arms do not spin—call a technician.

Yes No (arms do not spin)

You can change your answer later.

Retest and confirm

Run a full cycle with proper loading and detergent. Dishes should come out spot-free. If spots persist after all steps, consider a water softener or call a technician.

Done

Call a technician

Call an appliance technician if: the spray arms do not spin (motor or pump issue); you have tried rinse aid, cleaning spray arms, and adjusting loading and spots persist; or the dishwasher shows error codes. Routine spot fixes do not require disassembly.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a dishwasher leave spots on dishes?
Common causes: empty or low rinse aid, clogged spray arms, hard water (mineral deposits), overcrowded loading, wrong detergent amount, or water that is too cold. Check rinse aid and spray arms first.
Can I fix a dishwasher that leaves spots myself?
Yes. Most spot issues are fixed by refilling rinse aid, cleaning spray arms, adjusting loading, or using a dishwasher cleaner for hard water. No special tools needed.
When should I call a technician for spots on dishes?
Call a technician if you have tried rinse aid, cleaned spray arms, and adjusted loading and the spots persist; if the spray arms do not spin; or if the dishwasher shows error codes.

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