A dishwasher that’s not cleaning your dishes properly not only creates a lot of extra work, it can increase your water bill too! Doing dishes, pots, pans, and silverware by hand is both inconvenient and costly.
If your dishwasher is not working properly there are several possible causes for an ineffective dishwasher, including a dirty filter, a clogged spray arm, or a broken soap dispenser. To help you get your dishwasher cleaned effectively again, the experts at Mr. Appliance have put together this guide to help you pinpoint and resolve the problem.
Troubleshooting Tips for a Dishwasher That’s Not Cleaning Well
When your dishwasher is not getting dishes clean, cleaning the machine may fix the issue. After that, regular maintenance should keep your unit running efficiently. However, dirty components are not always the root of the problem. Here are some likely reasons that your dishwasher isn’t cleaning dishes well:
Dirty Interior
Things accumulate on the inside of your dishwasher: grease, bits of food, mineral deposits from hard water, soap scum, and more. Cleaning the interior of your dishwasher is a good first step when the dishwasher isn’t cleaning dishes well. If buildup is minor, try running a vinegar cycle: Pour 3 cups of white vinegar into the bottom of the unit, and run through a full cycle. To remove stubborn grime, use these dishwasher cleaning tips.
Dirty Filter
Dishwashers made before 2010 most likely have a self-cleaning filter that operates by grinding down food particles until they are small enough to wash away. Newer, quieter models typically have a removable filter that needs to be taken out and cleaned periodically. The filter is below the bottom rack, usually secured with a twist-off cap. To clean the filter, remove it from the machine (using the owner’s manual instructions) and rinse it thoroughly under hot water. If there’s a stuck-on gunk, soak it in hot, soapy water for several minutes and gently clean it with a soft brush before rinsing.
Clogged Spray Arm
Spray arms spin around below and/or above the dishwasher racks and shoot water to wash the dishes. The jets (tiny holes) in spray arms can get clogged, which reduces water pressure and their effectiveness. Cleaning the spray arms should help improve the cleaning process. Depending on your model, the arm may come off easily for cleaning, or you might need to remove a screw to take it out. Scrub it with a soft brush and dish soap, use a toothpick or bristled stick to dislodge particles and clear 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 be reaching your dishes, or it may not be released at the right time during the wash cycle. A common issue is a jammed 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 debris. If the spring or the dispenser door is broken, it needs to be replaced. Finally, check the gasket around the dispenser, and replace it if it’s cracked. Rubbing a small dab of petroleum jelly around the gasket occasionally can extend its life.
Low Water Temperature
Most dishwasher cycles require a water temperature of at least 120 degrees Fahrenheit to work properly. Some models have a heat-boosting mechanism built in, but if yours doesn’t, make sure that your water heater is set to 120 degrees. (Be careful! Setting the temperature any higher than 120 degrees creates a risk of scalding.) Finally, you can run the kitchen faucet for 30 to 60 seconds before starting the dishwasher to ensure that hot water enters the machine at the start.
Detergent and Related Issues
Low-quality or improper detergent can lead to spotty dishes. Using too much detergent can also cause problems. Be sure to use the right type of detergent and the appropriate amount. A final rinse agent should improve results, too. If you have hard water, consider installing a water softener to minimize mineral deposit damage. Lastly, be sure to load the dishwasher correctly.
Water Volume or Pressure Issues
Water pressure problems are likely to affect appliances like dishwashers and washing machines. If you’ve noticed that water pressure in your faucets has been lower than normal, or if the pressure seems to be fluctuating, you may need professional help to address the issue.
Failing Inlet Valve
The inlet valve allows water to flow into the dishwasher. If you’ve recently noticed a hammering sound coming from the unit as it runs, a faulty inlet valve is the likely culprit. Check your owner’s manual for dishwasher parts and replacement information. (This is a more complex repair that may help from your local Mr. Appliance)
Call Mr. Appliance for Your Dishwasher Repair Needs
A dishwasher that works properly is more than a convenience, it’s a necessity for big families. If you’re still, having trouble with your appliance? and don’t have the time to play dishwasher detective,? contact the pros at your local Mr. Appliance. We’ll pinpoint the issue, get the parts you need, and fix it fast. Connect with your local Mr. Appliance team or schedule an appointment online today for prompt, professional appliance repair service.
FAQs About Dishwashers Not Cleaning Dishes
Decades of experience, highly skilled service professionals, and a commitment to exceptional customer service have made Mr. Appliance a trusted leader in appliance maintenance and repairs. Our commitment to keeping your appliances up and running includes using our many years of experience and expertise to answer your questions. Here are answers to some of the most frequently asked questions about dishwasher repair.
Why is my dishwasher not cleaning dishes effectively?
One of the most common dishwasher frustrations is opening it after a cycle to find dishes still dirty. This typically happens because of buildup inside your appliance. Over time, grease, food particles, mineral deposits, and soap scum accumulate on the interior components of your dishwasher.
Quick Fix: Pour 3 cups of white vinegar into the bottom of your empty dishwasher and run a complete hot water cycle without detergent. This natural cleaning method helps dissolve buildup and residue that may be preventing your dishwasher from cleaning properly.
For stubborn buildup, you might need a more thorough cleaning approach. Remove and clean the filter, spray arms, and other removable components.
What not to do when your dishwasher is not cleaning effectively:
- Don't use regular dish soap in your dishwasher, as it creates excessive suds.
- Avoid ignoring mineral buildup if you have hard water.
- Don’t run partial loads—they don’t actually save water or energy!
- Don’t neglect regular maintenance cleaning.
- Never block spray arms with oversized items.
Is the spray arm causing my dishwasher to perform poorly?
If you've noticed your dishwasher not rinsing dishes properly, the spray arms might be the culprit. These components are critical to your dishwasher's cleaning performance.
The spray arms are the propeller-like parts that spin around inside your dishwasher, spraying water through tiny jets to clean your dishes. When these jets become clogged with food particles or mineral deposits, water can't flow freely, resulting in poorly cleaned dishes.
How to check and fix spray arms:
- Locate the spray arms (usually at the bottom of your dishwasher).
- Remove them according to your model's instructions.
- Hold each arm up to a light to check for clogged holes.
- Use a toothpick or small wire to clear any obstructions.
- Rinse thoroughly under warm water.
- Reinstall properly.
My dishwasher isn't rinsing dishes completely—why do I still see soap residue?
This frustrating issue usually stems from one of several problems:
- Water temperature issues: Your dishwasher requires hot water (at least 120°F) to properly dissolve detergent and clean effectively. If water isn't hot enough, detergent may not dissolve properly and can leave a residue.
- Detergent considerations: Using the wrong type or amount of detergent can cause rinsing problems. Too much detergent creates excess suds that can't be fully rinsed away.
- Rinse aid depletion: If your rinse aid dispenser is empty, your dishwasher may struggle to rinse dishes properly. Rinse aid helps water sheet off dishes and prevents spotting.
The best solution is to check your water heater temperature, ensure you're using the correct amount of the right detergent type for your machine, and keep the rinse aid dispenser filled.
When should I call for professional dishwasher repair instead of troubleshooting myself?
While many dishwasher issues can be resolved with DIY troubleshooting, certain situations will call for professional assistance:
- Unusual noises like grinding, buzzing, or hammering
- Water leaks onto your floor
- The dishwasher stops mid-cycle consistently
- The control panel displays error codes you can't resolve
- Electrical components aren't functioning properly
- The inlet valve needs replacement (indicated by hammering sounds)
Professional repair is particularly important for complex issues involving electrical components or water supply systems.
How can I prevent my dishwasher from developing cleaning problems?
Prevention is always better than troubleshooting! Here's a comprehensive maintenance routine to help keep your dishwasher running efficiently:
Daily Habits:
- Scrape large food particles from dishes before loading.
- Avoid overloading the dishwasher.
- Use fresh, quality detergent appropriate for your water hardness.
- Check for signs of dishwasher leaks around the base of the unit.
Weekly Care:
- Wipe down the door gasket and edges.
- Check spray arms for free movement.
Monthly Maintenance:
- Deep clean the filter (located at the bottom of the dishwasher).
- Inspect and clean spray arm jets.
- Run an empty load with a dishwasher cleaner or vinegar.
In addition to regular cleaning and maintenance, avoid these common mistakes to ensure you get the most out of your dishwasher:
- Pre-washing dishes too thoroughly: Modern dishwashers actually work better with some food residue that activates detergent enzymes.
- Clumping silverware: Don't nest spoons together!
- Blocking the detergent dispenser: Make sure tall items aren't preventing the dispenser from opening.
- Ignoring the filter: A clogged filter recirculates dirty water.
- Using regular dish soap: This creates too many suds and can damage your appliance.
By following these care tips, you'll help extend your dishwasher's life and enjoy sparkling clean dishes with every cycle!
This article is intended for general informational purposes only and may not be applicable to every situation. You are responsible for determining the proper course of action for your home and property. Mr. Appliance is not responsible for any damages that occur as a result of this blog content or your actions. For the most accurate guidance, contact the Mr. Appliance location nearest you for a comprehensive, on-site assessment.
