Cloudy glasses, gritty plates, or food residue baked onto dishes almost always point to a spray arm that isn’t spinning freely, hard water buildup, or a loading habit that’s blocking the water path, not a failed motor. Work through the checks below before assuming you need a part.
This page is one part of our full dishwasher troubleshooting guide. Dishes coming out smelly as well as dirty? That’s covered on its own in our dishwasher smells guide.
Quick Diagnosis Table
| Cause | Likelihood | Difficulty | Typical Cost |
|---|---|---|---|
| Clogged or stuck spray arm | Very likely | Easy | $0–20 |
| Overloaded or blocked rack | Likely | Easy | $0 |
| Hard water buildup | Likely | Easy | $5–15 |
| Water not hot enough | Possible | Easy | $0 |
| Worn door gasket | Possible | Easy–Moderate | $15–35 |
| Clogged inlet valve screen | Possible | Moderate | $0–20 |
| Wash motor losing power | Rare | Professional recommended | $100–250+ |
Repair or Replace?
Nearly everything on this page is free or under $35, so there’s essentially always a case for repairing over replacing. The one exception is a failing wash motor or pump assembly, which is a costlier, less common repair. On a dishwasher already past 8–10 years old, that’s the point to weigh a new unit instead.
Spray arm designs differ enough between Whirlpool, GE, Samsung, LG, Bosch, KitchenAid, Frigidaire, and Maytag that removal steps vary. Brand-specific guides are on the way.
Frequently Asked Questions
Why are my glasses coming out cloudy?
That's almost always hard water etching or mineral film rather than a cleaning failure. A rinse aid refill and an occasional citric acid cycle usually resolve it; permanent etching on glass, once it happens, can't be reversed.
Should I pre-rinse dishes before loading them?
No — modern detergents are formulated to work on food residue, and pre-rinsing can actually starve the wash cycle's soil sensor, causing it to under-clean. Scraping off large scraps is enough.
Why does only the top rack come out dirty?
That usually means the upper spray arm is clogged or not receiving enough water pressure, often because the lower spray arm or filter is restricting flow before water even reaches the top.
Can a full detergent dispenser cause poor cleaning if it won't open?
Yes — if the dispenser door is obstructed by a tall dish or utensil, some or all of the detergent never enters the wash, and you'll see food residue across most of the load.
How do I know if it's hard water versus a dirty filter?
Hard water leaves a white, chalky film on the tub interior and heating element; a dirty filter leaves food particles redeposited on dishes. Both often need addressing together.
Treat the steps above as a starting point, not a final diagnosis — a qualified repair professional should confirm anything more involved.
