7 Reasons Your Dishwasher Isn't Getting Your Dishes Fully Clean

Your dishwasher should be a huge timesaver. However, if your dishes come out still dirty after the cycle, you'll only end up washing them by hand again, wasting your time instead of saving it. If this is happening often, there are a few possible reasons preventing your dishwasher from doing its job. We asked cleaning experts to share the most common reasons why dishwashers fail to clean properly. Keep reading to discover their insights and tips on how to fix the issue.

You’re skipping the pre-rinsing step for your dishes

It might be tempting to toss a dish directly into the dishwasher, especially after a large meal or dinner gathering, but this could harm your appliance. Leaving large amounts of food on your plates may clog the dishwasher's pumps and spray arms, according to Mallory Micetich, home expert with Angi. “When food gets stuck, it can stop your dishwasher from draining or spraying water properly,” she explained. “You don't need to scrub with soap, but dishes should be rinsed to remove major food debris.”

You’re loading your dishwasher incorrectly

Are your glasses left with spots or your bowls still coated with remnants of last night's chili? This could be due to how you're loading your dishwasher. “Improper loading may prevent your dishes from coming out clean, so it’s important to follow the manufacturer's instructions for optimal loading,” suggested Micetich. Check the manual for the best loading arrangement. “This will ensure the spray arms aren’t blocked,” she added.

Also, don’t overload the dishwasher racks. “Avoid cramming dishes, cups, and other items on top of each other,” she said. Doing so could stop both the dishes on the top and bottom from being cleaned properly. “When overloaded, the spray nozzles might not reach all the dishes, leaving some dirty spots,” she added.

You’re not using the right settings

Most dishwashers offer various settings that cater to load size, water temperature, cycle duration, and whether extra rinses are needed. To get the best performance, it's important to be strategic about your settings. “When loading your dishwasher, think about what you're putting inside,” advised Micetich. Did you just finish a big Thanksgiving meal? Are you washing delicate glassware? Are pots and pans involved?

“Get to know the different cycles your dishwasher offers and when to use them,” she recommended. Once again, she suggested checking the appliance manual for more guidance. “Although dishwashers are generally easy to operate, you might be surprised by the helpful tips you'll find in your manual, which can guide you to pick the right settings for each wash cycle,” Micetich added.

You’re not using the best dish detergent

You might not give much thought to the dish detergent you pick, but being a little choosy can make a difference in your results. Cleaning experts recommend testing different brands to figure out which works best with your dishwasher.

Once you've settled on a detergent brand, there are various types to choose from: liquid, powder, tablets, and pods. “When selecting detergent for your dishwasher, one key thing to remember is not to overuse it,” Micetich warned. “Excess detergent can build up and cause your dishwasher to run less efficiently over time.” If your dishwasher is compatible with tablets or pods, they can help avoid using too much detergent, she added.

You’re not selecting the right water temperature

To ensure your dishes are properly cleaned, water temperature and pressure are key factors. “For optimal results, your dishwasher should operate at around 120 degrees,” explained Micetich. If the water isn’t hot enough, it can prevent detergent from dissolving correctly, making it harder to tackle grease. Additionally, low water pressure can affect detergent activation. “If you suspect an issue with temperature or pressure, it's a good idea to call a professional to diagnose the problem,” Micetich advised.

You’re running the dishwasher at the wrong time

Since the water needs to be hot to clean and sanitize effectively, running a shower or using other hot water appliances at the same time as your dishwasher isn’t ideal. “We suggest avoiding using other hot water systems while the dishwasher is operating to prevent diverting resources,” said Marla Mock, president of Molly Maid, a Neighborly company.

You’re neglecting to clean your dishwasher regularly

To keep your dishwasher running at its best, it’s important to clean it about once a month, advised Micetich. To clean it, empty the dishwasher, place a dishwasher-safe bowl filled with a cup of vinegar on the bottom rack, and run a hot water cycle. “After that, sprinkle some baking soda on the bottom and run a rinse cycle,” she suggested. Don't forget to clean the dishwasher filter by removing the bottom rack, taking out the filter, and scrubbing it with warm water and an old toothbrush to get rid of any stubborn residue.

You’re waiting too long to run the dishwasher

Dirty dishes left in the dishwasher can start to smell, especially if they weren’t rinsed before being loaded. Food particles can also build up in the drain filter, drain hose, spray arm, or other areas of the dishwasher, which can cause unpleasant odors, said Mock. “The smell can become especially foul if the leftover food includes fish, eggs, or other strong-smelling items,” she noted.

The longer you let your dishwasher sit unused, the more moisture and residue accumulate inside. “By using the dishwasher regularly, you can help keep it clean and running smoothly,” Micetich from Angi emphasized.