Dishwasher leaves gritty residue on glasses and dishes: grit usually comes from a dirty or incorrectly seated filter, blocked spray arms, poor loading, low fill or detergent that did not dissolve. Remove the filter, rinse it under running water and reseat it until it locks, checking for cracks in the mesh.
What this covers
- Dishwashers · wash quality
What it does not cover
Differential
Likely causes of “Dishwasher leaves gritty residue on glasses and dishes”, and how to tell them apart
- 1
The filter is dirty, cracked or not locked in place
What separates it Sandy grit collects at the bottom of glasses and in the tub, and the filter shows food, seeds or eggshell when you lift it out.
How to confirm Remove the filter, rinse it under running water and reseat it until it locks, checking for cracks in the mesh.
- 2
Spray-arm holes are blocked
What separates it Some dishes come out clean while others in the same spray zone have grit, and the arm looks clogged with scale or seeds.
How to confirm Turn each arm by hand and use a wooden toothpick to clear the holes without enlarging them.
- 3
Detergent is not dissolving
What separates it White or powdery grit appears on dishes and the cup, especially with cold water or a short cycle.
How to confirm Check the water temperature and the age and storage of the detergent, which can clump in humid places.
- 4
Hard-water scale is forming on dishes
What separates it A chalky feel that wipes off, worse on glasses and near the top of the tub.
How to confirm Check your local water hardness and compare the rinse aid and salt settings if your machine uses them.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the grit is food particles, undissolved detergent or a white mineral film.
- Which rack the gritty dishes come from and whether the same spot is affected every time.
- When the filter and spray arms were last cleaned.
Try in this order
0 of 4 completedObserve before changing anything
ReversibleIdentify whether grit is food, detergent or hard-water scale and check which rack is affected.
Isolate the failing boundary
ReversibleClean and lock the filter, rotate spray arms by hand, clear approved holes and verify items do not block movement.
Apply the narrow correction
ReversibleReload for spray access and test a normal cycle with fresh automatic-dishwasher detergent.
Verify the result and stop at the boundary
ReversibleService is appropriate when wash circulation is absent despite correct fill, filter and loading.
Stop boundary
When this stops being a self-service repair
- !Service is appropriate when wash circulation is absent despite correct fill, a clean filter and correct loading.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why are there small gritty particles on clean dishes?+
The most common cause is a dirty or misfitted filter that lets food particles recirculate. Clean the filter first, then the spray arms.
Why do my dishes feel gritty?+
A clogged filter or food trapped in the sump is the usual cause, because the wash water carries the grit back onto the dishes. Rinse the filter and wipe the sump.
Is hard water the cause?+
Hard water leaves a chalky film, not loose grit. Rinse aid and a dishwasher cleaner help the film, while the filter cleaning helps the grit.
What causes grit on dishes?+
A dirty or misfitted filter, blocked spray arms or hard water can leave grit.
Should I run a cleaning cycle?+
Clean the filter and run a cleaning cycle with a dishwasher cleaner.
Does detergent matter?+
Use fresh detergent and avoid over-loading.