Dishwasher not cleaning: loading, spray arms and cycle checks

Read the finished load before changing anything

Let hot dishes cool enough to handle. Inspect an affected plate, a glass and an item from the other rack. Photograph their positions before unloading. Distinct bits of food, a greasy patch and a white haze are different observations; a white mark by itself does not prove the dishwasher failed to wash.

If food is gone but glasses have spots or an even haze, use the cloudy-glass guide below. Film can be removable; confirmed etching is permanent. If the only problem is water on otherwise clean plastic or in cup bases, check drainage angle, rinse aid and the drying option. More detergent is not the first correction.

Scroll across to read every column.

1. Make room for water to reach the food

You need the model’s loading diagram and a flashlight for the first inspection, not a cleaner. Scrape large scraps into the trash. Do not hand-wash the entire load before using it to assess cleaning.

A clear hand rotation establishes clearance only. It does not establish that the arm receives water or rotates during a wash.

1. Separate nested bowls, overlapping plates and spoons pressed together. Aim dirty faces toward the spray source; angle bowls and cups so they drain. Use the rack positions approved for the items.
2. Move a large pan or cutting board that shields other dishes or blocks the detergent dispenser. Check utensils hanging below a basket and tall items beneath the next spray arm.
3. With the cycle off and the interior cool, gently rotate accessible arms as the manual permits. Move an item they strike. Do not force the arm or reach into a running dishwasher. Slide racks fully back into position.

2. Inspect spray openings, then the right filter system

Look for food lodged in visible spray holes. If the manual gives an owner-removal procedure, follow its power precautions, release method and reassembly check. Rinse the removed arm as directed. Use only the permitted tool; do not enlarge holes or pry against plastic. Refit it securely and check clearance again.

Next find the filtration diagram for the full model number. Whirlpool describes both a removable-filter style and a maintenance-free system with a separate foreign-object cup. A visible screen does not make every filter removable. Inspect and empty that cup only if the matching instructions specify it.

For an owner-removable filter with collected debris, clean and reinstall it using its component-specific directions. GE’s Ultra Fine filter allows careful sponge cleaning and warns against brushes; its Fine filter has different guidance. Confirm the stated seat or lock before running. If a screen is torn or a latch will not secure, get the correct part or service rather than testing with it missing.

3. Check detergent release before adding more

Use automatic dishwasher detergent, never hand dishwashing liquid. Check that powder or gel has been stored closed and dry, and add fresh detergent just before the wash. Put a packet in the compartment specified by the appliance and packet instructions; do not toss it into the tub to bypass an unexplained release problem.

Clear the dispenser door’s travel and avoid overfilling. For the Bosch SGE78B55UC, the manual specifically calls for dry hands and a dry dispenser for water-soluble pouches. An intact packet after a completed cycle warrants checking these conditions and spray access before assuming the dispenser is broken.

For loose detergent, follow the product directions and your model’s hardness/dose table. Confirm whether the appliance’s supply is softened. Harder water can need more detergent; excessive detergent in very soft water can harm glass. There is no useful universal teaspoon amount for these different products and dispensers.

Rinse aid helps water run off and reduces spotting. Refill an empty reservoir to its marked level and wipe spills. Do not automatically increase the setting: the Bosch manual distinguishes more rinse aid for spots from less for streaking. If food remains, continue with the wash checks even if spotting improves.

4. Match the cycle and check the incoming water

Check the selected program, including any remembered options. A rinse-only program is not a complete wash. Use the model’s normal or sensor program for ordinary soil and its suitable heavier program for dried-on food. A quick or light cycle may be inadequate for that load. If both racks are loaded, deselect single-rack or restricted wash-zone options where fitted.

For a machine specified for hot-water supply, compare a kitchen hot-tap temperature reading with its manual. GE and Whirlpool reference 120°F incoming water, about 49°C. Use a suitable kitchen thermometer in the stream or a heat-safe cup, keeping hands away from hot water. A sink reading checks the nearby supply, not the internal wash temperature or heater.

If the hot line takes time to warm, run the kitchen hot tap until hot before starting, where the manufacturer advises this. Avoid testing while a shower or other large hot-water demand is running. If supply temperature falls outside the model’s requirement, resolve that with the installer or a plumber; do not raise the household heater to an arbitrary hotter setting.

Run a comparison that actually tests washing

Choose one correction supported by what you found: separate the nested bowls, clear an obstruction, clean a dirty owner-serviceable filter, or select the appropriate cycle. Do not leave an unsafe or incorrectly assembled condition in place to preserve a comparison.

This is a household comparison, not a controlled appliance test. Rewash items with food remaining before using them.

1. Reassemble all removed parts and confirm locks. Use an ordinary, safely loaded batch with comparable food soil, including an affected type of item in the previously poor area. Scrape large scraps; do not test only with already-clean dishes.
2. Keep detergent, dose and other settings unchanged unless one of those is the correction. Note the change and take a before photo. Start a full wash and let it finish normally; check for a completion indication or an error.
3. After cooling, inspect the previously dirty surfaces, cup interiors and items in both racks. Success means the observed food is removed and loose grit is not redeposited. A dissolved packet, warm dishes or an empty tub alone does not demonstrate cleaning.
4. If the targeted area improves, retain that correction for the next normal load. If it does not, move to the next relevant check above. Repeatedly changing detergent, cycle and loading together makes it harder to tell which change helped.

When another wash is the wrong next step

If water remains above the model’s normal residual level or a drain error appears, follow drainage troubleshooting first. A whole-machine cleaning cycle addresses accumulated buildup; it does not establish that the appliance can wash a load.

For a leak, burning smell, electrical symptom or repeated error, stop the comparison and follow the model’s safety/support directions. Do not remove service panels, bypass the door latch or probe live parts. If correctly loaded dishes still retain food after the relevant checks, arrange service. Send the full model number, error code, residue locations and the completed-cycle comparison result. These observations are more useful than ordering a pump based on one dirty rack.