Here are some likely reasons why your dishwasher isn’t cleaning:
Dirty dishwasher
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Grease, small bits of food, hard water deposits, soap, etc. build up on the inside of your dishwasher. Cleaning the inside of your dishwasher is a good first step when your dishwasher isn’t cleaning dishes. If the soiling is minor, run the dishwasher without dishes in it using dishwasher detergent or just vinegar. Pour 3 cups of white vinegar on the bottom and run through a full cycle.
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Dirty filter
Older dishwashers (made before 2010) most likely have a self-cleaning filter that works by grinding up food particles until they get small enough to wash out. Newer, quieter models usually have a removable filter that must be taken out and cleaned periodically. The filter is under the racks, usually covered with a cap. To clean the filter, remove it from the machine and rinse it thoroughly with hot water. If there is any stuck-on residue, soak it in hot soapy water for a few minutes and gently clean it with a soft brush before rinsing.
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Clogged spray arm
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The spray arms rotate under and/or over the dishwasher racks. The jets (small holes) in the spray arms can become clogged, reducing water pressure. Cleaning the spray arms can improve dishwasher function. Depending on your model, the arm may break off easily for cleaning or you may have to remove a screw to get it out. Scrub it with a soft brush and soap, use a toothpick to remove clogs in the holes, and then rinse it well under hot water.
Broken soap dispenser
If your soap dispenser isn’t working properly, detergent may not reach your dishes or be released at the right time during the wash cycle. A common problem is a stuck spring in the dispenser door. Try using a small brush to clean the soap dispenser and springs. A mixture of hot water and vinegar will help dissolve grease and residue. If the dispenser spring or door is broken, it should be replaced. Finally, check the gasket around the dispenser and replace it if it is cracked. Occasionally rubbing a little petroleum jelly around the seal can extend its life.
Low water temperature
Most dishwasher cycles require a water temperature of at least 45 degrees to operate properly. But that may not be a high enough temperature to wash your dishes. Then use a program with a higher temperature. And make sure the dishwasher heater is in working order because it may actually be the problem if it can’t heat the water and the dishwasher is washing dishes with ice water.
Detergents and related problems
Low-quality or unsuitable detergent can lead to stained dishes. Using too much detergent can also cause problems. Make sure you use the right type of detergent and the right amount. The final rinse agent should also improve results. If you have hard water, consider installing a water softener to minimize mineral deposit damage. Finally, make sure you load the dishwasher properly.
Water volume or pressure problems
Water pressure problems are likely to affect appliances such as dishwashers and washing machines. If you’ve noticed that the water pressure in your taps is lower than normal, or if the pressure seems to fluctuate, you may need professional help to fix the problem.
Faulty inlet valve
The inlet valve allows water to flow into the dishwasher. If you’ve recently noticed a knocking sound coming from the appliance while it’s running, a faulty inlet valve is a likely culprit.