Most people assume their dishwasher cleans itself. After all, it uses hot water, detergent, and rinse aid multiple times a week. But if you have ever opened your dishwasher and noticed a funky smell, cloudy glasses, or food bits stuck to clean dishes, that is your sign that it needs attention.
Knowing how to clean a dishwasher properly can make a big difference in how well it performs and how long it lasts. Regular dishwasher cleaning helps prevent mold, buildup, leaks, and that unpleasant odor that creeps up over time. The good news is that learning how to clean the inside of a dishwasher is easier than most people think, and it does not require special tools or harsh chemicals.
This guide walks through how to clean a dishwasher step-by-step, including the filter, spray arms, seals, racks, and more. We will also cover how to clean a dishwasher with vinegar, what to do if you are dealing with mold, and how often this kind of maintenance should happen.
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Shop DishwashersWhat Happens When You Don’t Clean Your Dishwasher?
A dirty dishwasher does not always look dirty at first. Problems tend to build slowly, which is why they often get ignored.
Food particles can collect in the filter and spray arms, which blocks water flow and reduces cleaning performance. Grease and soap residue stick to the walls and seals, decreasing the effectiveness. Over time, moisture and debris create the perfect environment for mold and mildew to grow and build up.
If you neglect dishwasher cleaning for an extended period, you might notice dishes that come out gritty, cloudy, or still dirty. Some people experience leaks caused by clogged drains or seals that no longer close properly. In more extreme cases, mold growth can spread to areas you cannot easily see, which is when people start searching for, “How to clean a moldy dishwasher.”
Regular cleaning helps avoid all of these problems. It keeps your dishwasher working the way it should and protects your dishes, your kitchen, and your appliance investment.
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How To Clean a Dishwasher
If you want to know how to deep clean a dishwasher, the key is breaking it down into manageable parts. Instead of dumping cleaner in and hoping for the best, focus on each area that collects debris.
Before you start, empty the dishwasher completely. Remove any dishes, utensils, and racks if possible. Turn off the dishwasher or unplug it for safety.
Start by wiping down the interior walls and door with a damp cloth to remove loose debris. Pay attention to the bottom of the tub, where food and grease often collect. From there, you can move on to the parts that matter most.
If mold is present, it is important to address it promptly. Mold usually appears around seals, in the filter area, or along the door.
Wear gloves and use a vinegar solution or mild bleach solution if recommended by the manufacturer. Scrub affected areas carefully and rinse thoroughly. Make sure the dishwasher dries completely afterward.
Leaving the door slightly open between cycles can help prevent mold from returning.
→ Learn more: How Much Water Does a Dishwasher Use?
How to Clean Dishwasher Spray Arms
Spray arms are responsible for distributing water throughout the dishwasher. When they get clogged, dishes do not get clean.
Remove the spray arms if your model allows it. Most twist or pop off easily. Rinse them under warm water and inspect the holes. If you see debris, use a toothpick or small brush to clear each opening.
Soak the spray arms for 15 to 20 minutes in warm water with vinegar for a more thorough cleaning. This helps break down mineral deposits and grease. Rinse thoroughly before reinstalling.
How to Clean Dishwasher Filters
The filter is one of the most important and most overlooked parts of dishwasher cleaning. It catches food particles and prevents them from redepositing on dishes.
Locate the filter at the bottom of the dishwasher. Most modern models have a removable filter that twists out. Rinse it under warm running water and gently scrub with a soft brush or sponge.
Avoid harsh scrubbers that can damage the filter. If grease buildup is heavy, soak the filter in warm water with a small amount of dish soap before rinsing.
→ Learn more: Dishwasher Not Draining? Common Problems
How to Clean Dishwasher Racks
Dishwasher racks can collect grease, mineral deposits, and rust over time. Remove them if possible and rinse with warm water.
For stubborn buildup, scrub gently with a soft brush and dish soap. Pay special attention to corners and tines where residue tends to hide. If the rack coating is damaged, that is a sign it may need repair or replacement.
Let racks dry completely before placing them back in the dishwasher.
How to Clean Dishwasher Seals
Dishwasher seals, especially around the door, trap moisture and food residue. This is a common area for mold and mildew.
Use a soft cloth or sponge with warm water and mild dish soap. Gently wipe around the rubber gasket, pulling it back slightly to reach hidden areas. For mold, use a vinegar solution to help break it down.
If you are researching how to clean a moldy dishwasher, this step is especially important. Make sure seals are completely dry before closing the door.
How to Clean a Dishwasher with Vinegar
One of the most popular methods for dishwasher cleaning is using vinegar. It is inexpensive, effective, and safe for most dishwashers.
For a deeper clean, combine manual cleaning with a vinegar cycle. Start by cleaning the filter, spray arms, seals, and racks as described above. Place a dishwasher-safe bowl filled with white vinegar on the top rack. Run a hot water cycle with no dishes inside. The vinegar helps dissolve grease, mineral buildup, and lingering odors.
After that, you can sprinkle a small amount of baking soda along the bottom of the dishwasher and run a short hot cycle. This helps freshen odors and remove light stains. Avoid mixing vinegar and baking soda at the same time. Use them in separate cycles for best results.
This method works well as part of routine maintenance. It is especially useful if you are learning how to clean the inside of a dishwasher regularly rather than dealing with heavy buildup.
Other Things to Remember
- Check and clear the bottom drain area for food bits or labels that can block water flow.
- Clean the spray arms by rinsing the holes so water can spin and spray evenly.
- Wipe the door gasket and edges because grime hides there and can cause leaks or odors.
- Scrub the filter housing area under the filter since sludge can build up where you can’t easily see it.
- Use a toothbrush or small brush on crevices and around hinges where buildup is common.
- Skip bleach if your dishwasher has a stainless-steel interior because it can damage the finish.
- Don’t mix vinegar and bleach products during cleaning since the combination can create dangerous fumes.
- Clean the exterior with the right method (stainless cleaner or mild soap) to avoid streaks and scratching.
- Run an empty hot cycle after cleaning to flush out loosened debris and leftover cleaner.
- Recheck that the spray arms spin freely after reassembling everything so the next wash performs normally.
Once everything is clean and reassembled, you can finish with a cleaning cycle.
→ Learn more: When to Use (and Skip) Your Dishwasher's Heated Dry
Learning how to clean a dishwasher is one of the simplest ways to protect your appliance and improve your daily routine. A little regular maintenance goes a long way toward cleaner dishes, fewer odors, and a dishwasher that performs the way it should for years to come.
Dishwasher Cleaning FAQs
Most manufacturers recommend basic dishwasher cleaning once a month. This includes cleaning the filter, wiping down seals, and running a cleaning cycle. If you use your dishwasher daily or wash heavily soiled dishes, you may want to clean it more often. Regular maintenance helps prevent buildup and odors.
Mild dish soap, white vinegar, and baking soda are all effective for dishwasher cleaning. Soft brushes and microfiber cloths work well for scrubbing without causing damage. Avoid harsh chemicals or abrasive pads unless the manufacturer specifically allows them. No-name brands of dishwasher cleaners can work, but simple household items are often just as effective.
Vinegar is better for breaking down grease, mineral deposits, and odors. Baking soda is useful for deodorizing and removing light stains. For best results, use them in separate cycles rather than together. Both have a place in learning how to deep clean a dishwasher.
If your dishwasher is no longer cleaning properly even after maintenance, it may be time for a replacement. For buying a new dishwasher near Bellevue, Arnold’s Appliance is the best place to start. Our team can help you compare models, understand features, and find the right fit for your kitchen.
Why Trust Arnold’s Appliance?
Arnold's Appliance started in the summer of 1956 when it opened its doors as Lakeshore Appliance in Redmond, Washington. John Arnold and his family have since grown the store from just a few brands to the large appliance store it is today and moved to Bellevue in 1999 in search of a larger building. Arnold’s Appliance now offers high-end innovative products from over 45 manufacturers.
In addition to extensive product knowledge, Arnold’s has been providing fine appliances to Northwest builders, remodelers, designers, architects, and developers for over 47 years. Arnold's supplies products and installation to many of the finest custom and spec home builders in the Pacific Northwest. Along with single-family housing, Arnold's has also supplied products for some of the largest multi-unit projects in the area. Arnold’s, now the third generation of the Arnold Family, is dedicated to bringing the best quality products, delivery services, and installation to customers for years to come.
Shop Dishwashers at Arnold’s Appliance
Stop by Arnold’s Appliance Bellevue, WA location to see what a difference buying locally with an experienced staff can make. Or shop dishwashers online! Our friendly experts are always happy to help you — whether you call us at 425-454-7929, use our online chat feature, or visit us in person.
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