Food still stuck on dishes
Plates and bowls come out with bits of food, especially on the lower rack or in corners.
Start here: Start with loading, spray arm movement, and the dishwasher filter.
Dishwasher troubleshooting
Dishwasher Not Cleaning
Direct answer: When a dishwasher is not cleaning, the usual causes are blocked spray arms, a dirty dishwasher filter, poor loading, weak wash circulation, or water that never gets hot enough. Start with the easy visible checks before you assume a major part failed.
Most likely: Most often, the lower spray arm holes are packed with debris, the dishwasher filter is clogged, or tall items are blocking the spray pattern so detergent never gets blasted off the dishes.
First figure out what kind of bad cleaning you have: food still stuck on dishes, white film on glasses, detergent left in the cup, or dishes that come out dirty and wet. That first split saves time, because a circulation problem looks different from a detergent or drain problem.
Don’t start with: Do not start by buying a dishwasher pump or control part. A lot of bad-cleaning calls turn out to be loading, filter, spray arm, or hot-water problems.
If dishes have baked-on foodCheck spray arms, filter, and whether the dishwasher is actually blasting water around inside.
If glasses have film or gritCheck water temperature, detergent use, and whether dirty water is hanging in the sump or washing back onto dishes.
Last reviewed: 2026-04-01
What bad cleaning looks like matters
White film or cloudy glasses
Glasses look hazy, chalky, or gritty even though the cycle finishes.
Start here: Start with hot water, detergent amount, and whether the dishwasher is draining fully between washes.
Detergent pod or powder left behind
The dispenser opens poorly, the pod is partly intact, or detergent cakes in the cup.
Start here: Start with blocked dispenser access, wet detergent, and weak wash spray.
One rack cleans worse than the other
The top rack or bottom rack stays dirty while the other rack looks better.
Start here: Start with the spray arm for that rack and anything blocking its water pattern.
Most likely causes
1. Blocked or jammed dishwasher spray arms
If the arm holes are packed with paper, seeds, glass grit, or hard-water buildup, water cannot hit the dishes with enough force to clean them.
Quick check: Spin each dishwasher spray arm by hand with the racks in place. Make sure it turns freely and the holes are open.
2. Clogged dishwasher filter or debris in the sump area
A dirty filter cuts wash performance fast. Food scraps recirculate, water flow drops, and dishes come out gritty or still dirty.
Quick check: Remove the lower rack, inspect the dishwasher filter, and look for sludge, labels, bones, or broken glass around it.
3. Poor loading or blocked detergent dispenser
Tall pans, cutting boards, or large bowls can block the spray pattern or keep the detergent cup from opening cleanly.
Quick check: Look for anything in front of the dispenser door or directly above a spray arm path.
4. Weak wash circulation or low water temperature
If the dishwasher fills but never really sprays hard, or if the incoming water is lukewarm, detergent will not dissolve and food will stay put.
Quick check: Run hot water at the sink first, then start a cycle and listen after filling. You should hear strong swishing, not just a faint hum or trickle.
Step-by-step fix
Step 1: Start with loading, detergent, and hot water
These are the fastest checks and they cause a lot of bad-cleaning complaints without any failed part inside the dishwasher.
- Run the kitchen hot water until it turns fully hot before starting the dishwasher.
- Make sure large pans, cutting boards, and tall plates are not blocking the detergent dispenser or spray arm paths.
- Reload so bowls face down and inward, and avoid nesting spoons or stacking items too tightly.
- Use fresh dishwasher detergent. If pods or powder have gotten damp and clumpy, replace them.
- If you have heavy grease or dried-on food, choose a normal or heavy cycle instead of a quick rinse-style cycle.
Next move: If the next load comes out clean, the dishwasher likely had a setup problem, not a failed component. If dishes are still dirty, move to the spray arm and filter checks.
What to conclude: Bad loading and cool incoming water can mimic a mechanical failure. Fix those first so you do not chase the wrong problem.
Stop if:
- You smell burning plastic or wiring.
- The dishwasher leaks when you restart it.
- The door will not latch or the cycle will not start at all.
Step 2: Check the dishwasher spray arms for blockage or rubbing
If the spray arms cannot spin or the holes are plugged, the dishwasher may fill and run but never wash with enough force.
- Turn off power to the dishwasher before reaching deep inside the tub.
- Remove the racks as needed and spin the lower and upper dishwasher spray arms by hand.
- Look for labels, twist ties, seeds, glass chips, or mineral buildup blocking the spray holes.
- Rinse the spray arms under warm water and clear holes gently with a toothpick or similar non-metal pick if needed.
- Reinstall the racks and confirm nothing tall rubs the spray arms during a full rotation.
Next move: If cleaning improves right away, the dishwasher had a blocked or obstructed spray pattern. If the arms are clear and free but dishes still come out dirty, check the filter and sump next.
What to conclude: A dishwasher can sound normal and still clean badly if the water never reaches the dishes where it needs to.
Step 3: Clean the dishwasher filter and inspect the sump area
A clogged dishwasher filter is one of the most common reasons dishes come out with food still on them or with grit after the cycle.
- Remove the lower rack and take out the dishwasher filter according to the lock direction marked on it.
- Wash the dishwasher filter in warm water with mild dish soap. Use a soft brush only if needed.
- Wipe sludge and loose debris from the filter opening and sump area without forcing debris deeper.
- Look for paper labels, bone fragments, fruit pits, or broken glass around the sump cover.
- Reinstall the dishwasher filter securely so it seats flat and locks fully.
Repair guide: How to Clean a Dishwasher Filter
Step 4: Listen for real wash action after the fill
This separates a simple cleaning issue from a true circulation problem. A dishwasher that fills but only hums or trickles will not clean well no matter how clean the filter is.
- Start a normal wash cycle and let the dishwasher fill.
- After the fill sound stops, listen at the door for a strong, steady swishing sound.
- If safe on your model, crack the door briefly after wash starts and look for active water movement inside the tub, then close it again.
- If you hear only a hum, weak slosh, or repeated pauses, cancel the cycle and check for debris around the lower spray arm and filter area again.
- If the dishwasher fills and then drains out unexpectedly instead of washing, move to the fills-then-drains problem instead of replacing cleaning-related parts.
Next move: If you hear strong wash action, the main wash motor is probably working and the problem is more likely spray coverage, detergent, or water quality. If the dishwasher fills but never develops strong spray, the wash circulation side is the likely fault and a pro may be the smarter next step.
Step 5: Decide between a simple replacement and a pro call
By now you should know whether this is a visible dishwasher part issue or a deeper circulation problem that is not worth guessing at.
- Replace the dishwasher spray arm if it is cracked, split, warped, or will not stay mounted after you confirmed it is the source of poor cleaning.
- Replace the dishwasher filter if it is broken, missing mesh, or will not lock in place after cleaning.
- If the dishwasher door is not closing firmly or the cycle is inconsistent because the latch is failing, fix that issue before chasing wash performance.
- If the dishwasher fills but has weak or no wash pressure with a clean filter and clear spray arms, stop buying parts blindly and schedule service for the circulation system.
- If the machine fills then drains away instead of washing, switch to the dishwasher fills then drains problem because that is a different fault pattern.
A good result: If a damaged visible part was replaced and the next full load comes out clean, you are done.
If not: If visible parts check out and wash pressure is still weak, the likely issue is deeper in the dishwasher circulation system and needs proper diagnosis.
What to conclude: Common wrong move: replacing detergent, rinse aid, and random internal parts when the dishwasher never had proper spray pressure to begin with.
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FAQ
Why is my dishwasher running but not cleaning dishes?
Usually because water is not reaching the dishes with enough force. The common reasons are blocked dishwasher spray arms, a clogged dishwasher filter, poor loading, or water that starts too cold. If it fills but only hums or weakly sloshes, wash circulation is the bigger concern.
Can a clogged filter make a dishwasher stop cleaning?
Yes. A clogged dishwasher filter can cut wash performance fast. Food scraps stay in the wash water, spray pressure drops, and dishes come out dirty or gritty even though the cycle seems to run normally.
Why is the top rack not getting clean?
Start with the upper dishwasher spray arm and anything tall on the lower rack that blocks water upward. If only one rack cleans poorly, that usually points to a spray coverage problem before it points to a full-machine failure.
Why is my dishwasher leaving detergent in the dispenser?
Most often the dispenser door is blocked by a large item, the detergent got damp and clumped, or the dishwasher never developed strong enough spray to dissolve and carry the detergent. Cold incoming water can make this worse.
Should I replace the dishwasher pump if dishes are still dirty?
Not first. Check loading, hot water, spray arms, and the dishwasher filter before you spend money. If those are good and the machine fills but never produces strong wash action, then the circulation side needs proper diagnosis instead of guess-buying parts.
Does hard water make a dishwasher seem like it is not cleaning?
Yes. Hard water can leave white film, cloudy glasses, and mineral buildup in spray arm holes. That can look like a wash failure even when the dishwasher is still circulating. Clean the spray arms and filter first, then review detergent amount and water temperature.