Dishes Still Dirty After the Cycle? Causes and What to Check
If your dishwasher leaves film, grit or food on dishes, the cause is often loading, a dirty filter, blocked spray arms or detergent. Learn the checks to try first and what needs a technician.
Dishes that come out gritty, cloudy or still spotted with food are one of the most common dishwasher complaints. Often the machine is running fine and the fix is in how it is loaded or what goes into it. Sometimes a part has stopped doing its job.
Most causes come down to a handful of things: loading, the filter, the spray arms, detergent and rinse aid, water temperature, and then the wash pump, heater and inlet valve. Start with the simple ones before assuming a repair.
Turn off power at the breaker or unplug the dishwasher before reaching into the bottom of the tub or touching spray arms with hands wet. Take care with blades, glass fragments and hot dishes right after a cycle. Do not open the lower access panel or any part of the cabinet. If you suspect an electrical or leaking fault, stop using the machine.
What you can safely check first
- Check the loading. Large items can block spray arms or shield other dishes. Do not nest bowls or crowd the racks, and face dirty surfaces toward the centre.
- Scrape off big food pieces but do not pre-rinse heavily. Many detergents need some soil to work well.
- Remove and clean the filter at the bottom of the tub. Rinse it under the tap and brush off grease.
- Spin each spray arm by hand. It should turn freely. Look for blocked holes and clear them with a toothpick.
- Check the detergent: fresh, the right type for your machine, and not clumped. Use rinse aid if you have hard water.
- Run the kitchen tap until the water is hot before starting the dishwasher, so the first fill is not cold.
- Clean the door seal and the inside edges with a damp cloth, and run an empty hot cycle with a dishwasher cleaner if the tub looks filmy.
Common causes
Overloading or blocked spray arms
Water has to reach every surface. A tall pot or a loose utensil can stop an arm from turning, and mineral deposits can clog its holes. Unblocking and reloading often fixes the problem straight away.
A clogged filter
If food builds up in the filter, water carries debris back onto the dishes. This causes grit and a dull film. Cleaning the filter regularly helps prevent it.
Detergent, rinse aid and water temperature
Old or low-quality detergent, too little rinse aid in hard water, or water that is not hot enough all leave residue. Cold water can fail to dissolve detergent and grease properly. Running the tap hot first helps, and is a quick test of whether temperature is the issue.
A weak wash pump or failing heater
The wash pump drives water through the spray arms. If it is worn, pressure drops and cleaning suffers. A heating element that has failed leaves the water too cool for proper washing and drying. A technician tests both.
A faulty inlet valve
The inlet valve lets water into the tub. If it opens only partly, the machine may not fill enough, so the arms spray air or too little water. Dishes then come out dirty even though the cycle finished. A technician can confirm this and replace the valve if needed.
When to call a technician
Call a technician if you have cleaned the filter, freed the spray arms, used fresh detergent and hot water, and results are still poor. Call also if you hear unusual noises, the tub looks low on water, or the dishes come out cold and wet.
A technician can test the pump, heater and inlet valve safely and tell you what the repair involves before any work begins.
Still not working? Book a dishwasher repair and tell us the model number and what you have checked.
Frequently asked questions
Why are my dishes cloudy after washing?
Cloudiness is often from hard water residue or too much detergent. Try rinse aid and a cleaning cycle. If the film is still there, a technician can check the water fill and heat.
Should I pre-rinse dishes before loading?
Scraping is enough. Many modern dishwashers use sensors and detergent that work better with some food soil on the dishes.
Why is there grit on my glasses?
Grit usually points to a clogged filter or spray arms. Clean both, and make sure the filter is locked back in place.
How do I know if the heater has failed?
Dishes may be wet and cool at the end, and grease may remain. Only a technician can test the heating element safely.
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