Why is my dishwasher not cleaning my dishes?

1. Not scraping off food particles before loading.

One of the most common reasons for a dishwasher's inefficiency is the presence of food debris still on the dishes when you load them. If your dishwasher is not cleaning as it should, inspect your dishes before loading them inside. Rinse and scrape off any visible food remnants. 

2. Water temperature and dishwasher detergent. 

Water temperature plays a vital role in your dishwasher's performance. If the hot water entering your dishwasher isn't at the optimal temperature (typically around 120°F or 50°C), your dishwasher will have trouble breaking down the grease and grime on your dishes. 

You can confirm if your water temperature is the culprit by running the kitchen sink's hot water for a few minutes before starting the dishwasher. If the water is still cold, you may need to troubleshoot your hot water heater or hire a plumber to fix it.

Additionally, make sure you're using a high-quality dishwasher detergent that's suitable for your dishwasher.

3. Dirty filter and clogged inlet valve.

A dirty and clogged dishwasher filter can prevent water from flowing freely during the wash cycle, leading to poor cleaning results. Check your owner's manual to locate the filter (it's usually on the bottom of your dishwasher.). Then, follow these steps to clean the filter using a soft brush and water.

Similarly, a malfunctioning inlet valve can restrict water flow, affecting your dishwasher's cleaning performance. If you suspect a faulty inlet valve, it's best to hire a dishwasher repair professional for inspection and potential replacement.

4. Wash cycle duration and settings.

Sometimes, dishwashers may not clean properly because you chose the wrong wash cycle or setting.

Ensure you're selecting the appropriate cycle for the type of load you have, such as heavy-duty for pots and pans or a quick wash for lightly soiled items. Additionally, longer wash cycles may yield better results for heavily soiled dishes, allowing more time for thorough cleaning.

Related: How to reset your dishwasher in 3 steps.

5. Overloading and improper loading. 

Overloading the dishwasher or improperly stacking dishes can hinder water and detergent distribution, resulting in uncleaned items. Don't overcrowd the dishwasher — leave enough space for water to reach every dish. 

It's also important to avoid nesting a small bowl inside of a bigger one or placing large items in front of the spray arm. This can obstruct the cleaning process.

6. Mineral deposits and hard water. 

Mineral deposits from hard water can build up over time, affecting the dishwasher's performance. To combat this issue, periodically clean your dishwasher with a vinegar solution. Place a bowl of white vinegar on the top rack of the dishwasher and run it on an empty cycle. The vinegar helps dissolve mineral deposits and eliminates unpleasant odors.

Consider installing a water softener to reduce mineral buildup and improve your dishwasher's cleaning effectiveness. A water softener helps prevent the negative impact of hard water on your dishes and dishwasher components.

Related: How do you know if you have hard water?

7. Clogged spray arm. 

A clogged spray arm can hinder water distribution, resulting in inadequate cleaning. Check the dishwasher spray arm for any debris or buildup, and clean it thoroughly. If the spray arm is damaged, consider replacing it to restore proper water circulation.

Related: Why won’t my dishwasher drain? 6 troubleshooting tips.

8. Undissolved dishwasher tablets. 

One common issue leading to dishes failing to clean during a cycle is the incomplete dissolution of the dishwasher tablet. Inspect the tablet collecting tray, and ensure it has completely dissolved during the wash cycle.

Help ensure your dishwasher properly cleans your dishes.

Remember the following tips to ensure this issue with your dishwasher doesn't happen again anytime soon:

• Run the kitchen sink's hot water before starting the dishwasher to ensure the water is at the right temperature.
• Properly load the dishwasher, allowing the spray arm to rotate freely and reach all dishes.
• Use a high-quality dishwasher detergent suitable for your water hardness level.
• Clean the dishwasher filter regularly to avoid clogs and ensure optimal water flow.
• Consider installing a water softener if you have hard water, as it can improve cleaning results.
• Use rinse aids or rinse agents to enhance the dishwasher's drying performance and prevent water spots.

With any luck, these tips will resolve any issues with a dishwasher not cleaning dishes.

Find pros who can fix your dishwasher. 

If you've tried troubleshooting and your dishwasher still isn't cleaning the dishes properly, it might be time to seek a professional's help. Depending on the problem, you may need to hire an appliance repair technician, a plumber, or a handyman with experience in dishwasher repairs.

Use the Thumbtack app to connect with local pros who can ensure your dishwasher is back in top-notch condition. Compare the top-rated pros near you, ask for price quotes, and schedule service today.