How to Deep Clean Your Dishwasher
Written by Shannon, Owner and Founder of Long Island MaidsYour dishwasher cleans your dishes, but what cleans your dishwasher? Over time, food particles, grease, and mineral deposits build up inside, causing odors and reducing cleaning performance. Here's the complete deep clean process I use in Long Island kitchens.
A neglected dishwasher doesn't just smell bad—it actually makes your dishes dirtier. I see this constantly in Great Neck and Manhasset kitchens: homeowners wondering why their dishes come out spotty and smelling off. Nine times out of ten, the dishwasher itself is the problem.
The good news? A proper deep clean takes about 30 minutes of hands-on time (plus two wash cycles), and you'll notice an immediate difference. This is the same process our team uses during every deep cleaning service.
Signs Your Dishwasher Needs Cleaning
If you're experiencing any of these issues, your dishwasher is overdue for a deep clean:
What You'll Need
The Complete Deep Clean Process
This is the exact method our team uses in Garden City, Roslyn, and every kitchen we clean across Nassau County.
Empty and Remove Parts
Remove all dishes, racks (both upper and lower), and the utensil holder. This gives you access to all the areas that need cleaning and lets you wash the racks separately in the sink.
Clean the Filter
The filter is at the bottom of the dishwasher, usually under the lower spray arm. Twist and lift to remove it. Rinse under hot water and scrub with a brush and dish soap to remove trapped food. This is the #1 cause of dishwasher odors—I can't stress this enough. Clean it monthly.
Clear the Spray Arm Holes
Remove the spray arms (they usually twist off). Hold them up to the light—you should be able to see through each hole. Use a toothpick to clear any blocked holes. Mineral deposits and food particles clog these constantly in Long Island homes. Rinse thoroughly and reinstall.
Clean the Door Seal and Edges
The rubber gasket around the door catches grime, mold, and food debris. Dip a toothbrush in soapy water and scrub all around the gasket, pulling it back gently to clean inside the folds. Wipe the door edges and the area around the latch—this spot is always disgusting when I check it in client homes.
Wipe Down the Interior
Use a damp microfiber cloth to wipe the interior walls, door interior, and around the drain area. Pay attention to corners and crevices where gunk accumulates. For stubborn spots, a paste of baking soda and water works well.
Run the Vinegar Cycle
Place a dishwasher-safe cup or bowl filled with 2 cups of white vinegar on the top rack. Run a full hot water cycle (no dishes, no detergent). The vinegar breaks down grease, removes odors, and dissolves mineral deposits.
Run the Baking Soda Cycle
After the vinegar cycle completes, sprinkle 1 cup of baking soda across the bottom of the dishwasher. Run a short hot cycle. This freshens and brightens the interior, removing any remaining odors and stains.
Before running the vinegar cycle, check the drain at the bottom for any large debris—broken glass, food chunks, or small items that fell through. Remove anything you find. A clogged drain is a common cause of poor dishwasher performance and standing water.
Tackling Long Island's Hard Water Buildup
Nassau and Suffolk Counties have notoriously hard water, and I see the results in dishwashers constantly—white, chalky deposits on interior walls, spray arms, and racks. The vinegar cycle helps, but for heavy buildup:
- Citric acid treatment: Run an empty cycle with 1 cup of citric acid powder (found in canning supplies or buy as "Lemi Shine"). This is more aggressive than vinegar for mineral deposits.
- Increase vinegar frequency: Run a vinegar cycle every 2 weeks instead of monthly if you have very hard water.
- Use rinse aid: Fill the rinse aid dispenser and keep it full. Rinse aid helps prevent new deposits from forming and improves drying.
- Consider a water softener: For severe hard water issues throughout your home, a whole-house water softener is worth the investment.
If you want to sanitize with bleach (1/2 cup in an empty hot cycle), never use it in the same cycle as vinegar—they create toxic chlorine gas. Wait at least one full cycle between treatments.
Maintenance Habits for a Cleaner Dishwasher
A few simple habits prevent most dishwasher problems. This is what I recommend to all my Old Westbury and Syosset clients:
- Scrape (don't rinse) dishes: Remove large food chunks but don't pre-rinse—modern detergents need some food to work against. Over-rinsing actually reduces cleaning effectiveness.
- Run hot water first: Run your kitchen faucet until the water is hot before starting the dishwasher. This ensures the first fill is hot water, not lukewarm.
- Leave door ajar after cycles: Let moisture escape to prevent mold and mildew growth. Even cracking it an inch helps.
- Clean the filter monthly: Set a reminder—this is the single most important maintenance task.
- Wipe the door seal weekly: A quick wipe with a damp cloth prevents grime buildup in the folds.
- Use quality detergent: Cheap detergent leaves more residue and cleans less effectively. Pods generally work better than powder.
Troubleshooting Common Issues
Dishes still dirty after washing: Usually caused by blocked spray arms, a dirty filter, or overloading. Make sure spray arms can spin freely and dishes don't block water flow.
White film on glasses: Hard water deposits. Increase rinse aid usage and run a citric acid or vinegar cycle. Make sure your water heater is set to at least 120°F.
Standing water at bottom: Check the drain for clogs. Also check that the knockout plug was removed from the garbage disposal connection—this is a common issue in new installations.
Persistent odor even after cleaning: Check for food trapped in the door seal folds, the air gap (if you have one), or the drain hose. Sometimes mold grows in these hidden areas and requires more thorough cleaning.
I had no idea the filter was even a thing you were supposed to clean. Shannon's team showed me how disgusting it was—no wonder my dishwasher smelled. They deep cleaned everything and now it works like new. The glasses actually sparkle again.
When to Hire Long Island Maids Instead
Dishwasher deep cleaning is part of every kitchen cleaning we do. But here's when it really makes sense to call us:
Your Dishwasher Has Serious Buildup
If your dishwasher hasn't been cleaned in years—and I've seen some that never have—the DIY method might not be enough. Heavy mineral deposits, mold in the door seal, and clogged drain lines sometimes need professional attention. Our deep cleaning service handles the worst cases.
Your Whole Kitchen Needs Attention
The dishwasher is just one appliance. Add the garbage disposal, microwave, refrigerator, and oven—suddenly you're looking at a full day of work. Our team handles it all in one visit.
You're Preparing for a Special Occasion
Hosting Thanksgiving in Manhasset? Getting ready for holiday guests? Our holiday cleaning service ensures every appliance is spotless before company arrives.
You Want Consistent Results
Most of our Great Neck, Port Washington, and Jericho clients hire us for recurring service. Weekly or biweekly cleaning means your appliances never get the chance to build up gunk in the first place.
Need Help With All Your Appliances?
Our deep cleaning service includes inside the dishwasher, oven, refrigerator, and microwave. Book once, enjoy spotless appliances.
Serving: Great Neck · Manhasset · Garden City · Old Westbury · Roslyn · +40 more
Frequently Asked Questions
How often should I deep clean my dishwasher?
Deep clean your dishwasher monthly. Clean the filter monthly (or more often if you use the dishwasher daily), wipe the door seal weekly, and run a vinegar cycle monthly to prevent buildup. With Long Island's hard water, you may need vinegar cycles every 2 weeks.
Why does my dishwasher smell bad even after cleaning?
Persistent odors usually come from food trapped in the door seal folds, the air gap (if you have one), or the drain hose. Check these hidden areas for mold or debris. The filter is the most common culprit—make sure it's completely clean, including any mesh screens.
Can I use bleach to clean my dishwasher?
Yes, you can use 1/2 cup of bleach in an empty hot cycle to sanitize—this is especially useful if you've had mold issues. However, never mix bleach with vinegar as they create toxic chlorine gas. Wait at least one full cycle between bleach and vinegar treatments.
Why do my dishes have a white film after washing?
White film is almost always hard water deposits—very common on Long Island. Solutions include increasing rinse aid usage, running a vinegar or citric acid cycle, making sure your water heater is set to at least 120°F, and using a detergent designed for hard water.
Does Long Island Maids clean dishwashers?
Yes! Dishwasher cleaning—inside and out, including the filter and door seal—is included in our deep cleaning service and can be added to recurring cleanings. We clean all kitchen appliances throughout Nassau and Suffolk Counties. See our cleaning checklist for everything we cover.
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