To clean a dishwasher, remove and rinse the filter, wipe down the door seal, run an empty hot cycle with white vinegar on the top rack, then run a second cycle with baking soda sprinkled on the floor. Do this monthly to remove grease, limescale, and odor-causing bacteria.
If your dishes are coming out with a faint smell, water spots, or a cloudy film, the problem probably isn’t your detergent — it’s your dishwasher itself. Most people never clean the machine that’s supposed to clean everything else, and over time that leads to grease buildup, clogged spray arms, and a filter swimming in old food particles.
The good news: cleaning a dishwasher takes under 30 minutes and costs almost nothing. In this guide, you’ll learn exactly how to do it — from the filter to the door gasket — using items you almost certainly already own.
Why cleaning your dishwasher matters in 2026
A dishwasher cleans dishes with hot water and detergent, but food debris, grease, hard water minerals, and soap scum accumulate in its filter, spray arms, and door seal over time. Without regular cleaning, those deposits recirculate onto your “clean” dishes.
According to NSF International, the dishwasher filter is one of the top five germiest spots in a typical home. Regular cleaning also extends the appliance’s lifespan — a clogged filter strains the pump and can shorten a dishwasher’s life by years.
- Removes odor-causing bacteria and mold from the door gasket
- Eliminates limescale buildup that clouds glassware
- Unclogs spray arm jets for better water distribution
- Keeps the filter flowing freely so the pump isn’t overworked
Key takeaway: Clean your dishwasher once a month for daily-use households, or every 2–3 months for occasional use. The whole process takes about 20–30 minutes of actual effort.
How often should you clean your dishwasher?
For households running the dishwasher daily, a monthly deep clean is ideal. If you use it a few times a week, every 6–8 weeks is sufficient. Signs you need to clean it sooner: a musty smell, cloudy glasses, or visible gunk around the filter or door seal.
1. Clear and inspect the interior
Before cleaning anything, remove all dishes and racks. Pull out the bottom rack completely and set it aside. This gives you full access to the floor of the dishwasher where most debris collects.
Take a moment to look around. Check the spray arms (the spinning plastic pieces with holes), the walls, and the bottom drain area. Look for broken glass, toothpicks, or food chunks that shouldn’t be there — these can damage your pump.
- Remove any visible food debris by hand or with a damp paper towel
- Check that the spray arm holes aren’t visibly clogged
- Note any dark mold spots on the door gasket — those need special attention in Step 3
Pro tip: Do this inspection before every cycle, not just during deep cleans. It takes 10 seconds and can prevent a lot of problems.
2. Clean the dishwasher filter — the most important step
The filter is the most neglected part of any dishwasher and the most important to clean. Most modern dishwashers have a manual filter — a cylindrical mesh piece at the bottom of the tub — that traps food particles during every wash cycle.
How to remove and clean a dishwasher filter
- Locate the filter — it’s usually in the back-left or center of the tub floor, with a twist-lock cap
- Turn it counterclockwise (about a quarter turn) and lift it out
- Take out the flat mesh filter underneath it as well
- Rinse both pieces under warm running water
- Use an old toothbrush with a drop of dish soap to scrub away any grease or film
- Rinse thoroughly and reinstall — twist clockwise until it clicks
Key takeaway: A clogged filter is the number one cause of smelly dishwashers and poorly cleaned dishes. Clean it at least once a month.
3. Wipe down the door seal, spray arms, and interior walls
The rubber door gasket (the seal around the inner edge of the door) is a prime spot for mold and mildew. Fold it back gently and wipe along both sides using a damp cloth dipped in a mix of equal parts white vinegar and warm water.
For stubborn black mold on the gasket, use an old toothbrush with a small amount of baking soda paste (baking soda + water). Scrub gently and wipe clean. Don’t use bleach on rubber seals — it degrades the material over time.
- Door gasket:Â wipe with vinegar-water solution; scrub mold with baking soda
- Spray arms:Â remove them (they usually just pull up or unscrew), soak in warm soapy water, use a toothpick to clear clogged holes
- Interior walls & door panel:Â wipe down with a damp cloth; pay attention to the bottom edge of the door (a common grease trap)
- Utensil holder:Â remove and rinse under the tap
Key takeaway: The bottom edge of the door — the part that doesn’t get sprayed during a wash cycle — collects the most standing gunk. Always wipe it manually.
4. Run a hot vinegar cycle to descale and deodorize
White vinegar is a natural descaler that breaks down mineral deposits and kills bacteria. It’s one of the most effective and affordable ways to deep-clean a dishwasher’s interior — without harsh chemicals.
Place a dishwasher-safe bowl or cup filled with one cup of white distilled vinegar on the top rack. Run a hot water cycle (no detergent, no other dishes). The vinegar will disperse through the machine, breaking down limescale and neutralizing odors.
- Use distilled white vinegar — not apple cider vinegar (which can leave residue)
- Place it on the top rack so it disperses from the top down
- Use the hottest wash setting available
- Do not add detergent during this cycle
Key takeaway: The acidity in white vinegar (typically 5% acetic acid) effectively dissolves mineral buildup — the same deposits that cause cloudy glassware and spotty dishes.
Can I use dishwasher cleaning tablets instead of vinegar?
Yes. Commercial dishwasher cleaning tablets (like Finish Dishwasher Cleaner or Affresh) are convenient and very effective. They’re a good alternative if you prefer not to use vinegar or if your dishwasher manual advises against it. Follow the product instructions — most are simply placed in the detergent cup or bottom of the tub.
5. Freshen with a baking soda rinse cycle
After the vinegar cycle, the final touch is a short baking soda cycle. Baking soda deodorizes, lifts any remaining stains on the interior walls, and leaves your dishwasher looking noticeably brighter.
Sprinkle one cup of baking soda evenly across the floor of the empty dishwasher. Run a short hot-water cycle. That’s it. You’ll notice the interior smells fresh and looks cleaner around the edges and walls.
- Don’t mix baking soda and vinegar in the same cycle — they cancel each other out
- Use a short or quick wash cycle for this step — it doesn’t need to be long
- This step is optional but makes a visible difference on stained interiors
Key takeaway: Baking soda is a mild abrasive and odor absorber. Combined with hot water, it polishes the stainless steel interior and neutralizes any remaining sour odors.
Common dishwasher cleaning mistakes to avoid
Even with the best intentions, these mistakes will undermine your efforts or damage your machine:
✕ Using bleach on stainless steel interiors. Bleach corrodes stainless steel and damages rubber seals. Stick to vinegar, baking soda, or manufacturer-approved cleaners.
✕ Never cleaning the filter. Skipping the filter defeats the entire purpose of cleaning. The filter is where most of the smell and bacteria originate.
✕ Putting vinegar in the detergent dispenser. The dispenser releases liquid at a specific time in the cycle. Putting vinegar on the top rack gives better coverage throughout the entire wash.
✕ Ignoring the door gasket. That black mold growing in the rubber seal is exactly what’s causing your dishwasher to smell. It won’t go away on its own — you have to scrub it manually.
✕ Cleaning with cold water cycles. Hot water is essential for dissolving grease and activating vinegar’s descaling properties. Always select the hottest cycle when running a cleaning wash.
Tools & products for cleaning your dishwasher
You don’t need much. Here are the products and tools worth having:
- White distilled vinegar: Natural descaler and deodorizer. Inexpensive and highly effective for limescale.
- Baking soda: Mild abrasive that deodorizes and polishes the interior. Use after the vinegar cycle.
- Old toothbrush: Essential for scrubbing the filter, spray arm holes, and door gasket. Replace every few months.
- Finish Dishwasher Cleaner: Tablet-based commercial cleaner. Convenient alternative to the vinegar method for monthly cleans.
- Affresh Dishwasher Cleaner: Another popular commercial option that’s effective against hard water buildup and odor.
- Microfiber cloth: For wiping down interior walls, the door panel, and gasket without scratching surfaces.
Frequently asked questions
How often should I clean my dishwasher?
For daily-use households, do a full deep clean once a month. The filter should be rinsed even more frequently — every 2–3 weeks. Light users (a few times per week) can do a full clean every 6–8 weeks. The more you use it, the faster buildup occurs.
Why does my dishwasher smell bad even after washing?
A persistent bad smell almost always comes from a dirty filter, mold in the door gasket, or food debris trapped near the drain. Clean the filter first — that’s the most common culprit. Then scrub the door seal and run a hot vinegar cycle to neutralize bacteria causing the odor.
Can I use bleach to clean my dishwasher?
Only if your dishwasher has a plastic interior — never use bleach on stainless steel, as it causes corrosion and discoloration. Bleach also degrades rubber gaskets over time. For most dishwashers, white vinegar and baking soda are safer and equally effective alternatives.
How do I clean the spray arms on my dishwasher?
Gently pull or unscrew the spray arms (consult your manual if needed), soak them in warm soapy water for 10–15 minutes, then use a toothpick or thin skewer to clear any blocked holes. Rinse well before reattaching. Do this every 3–4 months or when you notice poor wash results.
What is the fastest way to clean a dishwasher?
The fastest method is a commercial dishwasher cleaning tablet — place it in the tub, run a hot cycle, done in about 30 minutes with minimal effort. For a deeper clean that costs less, the vinegar method takes the same time but requires a few minutes of manual prep first.
Why are my glasses cloudy after washing?
Cloudy glassware is typically caused by hard water mineral deposits (limescale) or etching from harsh detergent. Run a vinegar cycle to descale the machine interior. Also check your rinse aid level — rinse aid significantly reduces spotting and cloudiness on glassware.
Conclusion
Cleaning a dishwasher is genuinely one of the highest-return 30-minute tasks in any home. Here are the three things that matter most:
- Clean the filter monthly — it’s the root cause of most dishwasher problems
- Run a hot vinegar cycle — it descales, deodorizes, and kills bacteria at the same time
- Wipe the door gasket manually — no wash cycle reaches it, so you have to do it by hand
The next time you run a load of dishes, take 2 minutes to check the filter and wipe the seal. That habit alone will keep your dishwasher smelling clean and performing well for years. Your dishes — and your appliance — will thank you.
