3 Ways to Clean a Smelly Dishwasher

Why Does a Dishwasher Smell Bad?

A dishwasher is basically a warm, damp box that eats food scraps for breakfast. If anything interrupts the “wash it
all away” process, odor shows up fast. The most common culprits are:

• A dirty filter (food particles + grease = funk factory)
• Clogged spray arms that can’t blast debris off dishes
• Sludge in the drain area or around the sump at the bottom of the tub
• Grime in the door gasket and corners where water doesn’t fully rinse
• Drain/garbage disposal issues that send sink smells back into the dishwasher
• Hard-water scale that traps oils and detergent residue
• Mold or mildew if the interior stays wet and closed all the time

Translation: the smell isn’t “mysterious.” It’s just old food doing what old food doesbecome an emotional support
compost pile.

Before You Start: The 5-Minute Smell Detective

You’ll fix the odor faster if you know where it’s coming from. Here’s a quick checklist before you pick a cleaning
method:

1. Open the door and sniff low. Strongest at the bottom? Filter/drain area is suspect #1.
2. Check for standing water in the bottom of the tub after a cycle. Standing water = draining issue.
3. Look at the filter (usually under the lower spray arm). If it’s gritty or slimy, congratsyou found the villain.
4. Run your finger along the door gasket (rubber seal). If it feels greasy, it’s holding onto odors.
5. Smell the sink/garbage disposal too. If the sink reeks, the dishwasher may be “sharing” that fragrance.

If you’re not sure, start with Way #1. Mechanical cleaning (filter + seals + drain area) solves the majority of
dishwasher odor problems without fancy chemistry.

Way #1: Deep-Clean the Filter, Drain Area, Spray Arms, and Door Gasket

This is the “lift the hood” method. It’s not hard, but it is oddly satisfyinglike finally cleaning under the
couch and finding a missing sock plus $0.37 in change.

Step 1: Empty the dishwasher (yes, even the little utensil cup)

Remove dishes, racks if you need more room, and the utensil holder if it pops out easily. You want access to the
bottom of the tub and the filter assembly.

Step 2: Remove and wash the dishwasher filter

Many modern dishwashers have a removable filter that twists or lifts out near the bottom. Check your manual if you
don’t see an obvious release. Once it’s out:

• Rinse under hot running water to remove loose debris.
• Scrub gently with warm, soapy water using a soft brush or old toothbrush.
• If gunk is stuck in crevices, let it soak for 10–15 minutes in warm, soapy water, then scrub again.

A clean filter is the single biggest upgrade for dishwasher odor removaland it can help your dishes come out
cleaner, too.

Step 3: Wipe the drain area and remove any “surprise snacks”

With the filter out, look into the area beneath it. Use paper towels to remove debris (think: lemon seeds, bits of
labels, popcorn kernels, broken glassaka the dishwasher’s greatest hits).

If you see standing water or a thick sludge layer, wipe what you can safely reach. Don’t jam tools into parts you
can’t identify. The goal is to remove food buildup, not start a side quest called “accidental appliance surgery.”

Step 4: Unclog the spray arms

Spray arms have small holes (jets) that can clog with mineral scale or food bits. When water can’t spray correctly,
grime stays behindand smells move in rent-free.

• Inspect the holes. If you see blockage, use a toothpick or a thin wire to gently clear it.
• Rinse the spray arms under warm water.
• If your model allows removal, take them off and rinse thoroughly, then reinstall.

Step 5: Clean the door gasket and corners (the grime penthouse)

That rubber seal around the door is a prime spot for grease and mildew. Wipe it with a damp cloth first. For
stubborn grime, use a baking soda paste (baking soda + a little water), let it sit about 10–15 minutes,
then gently scrub with a soft brush and wipe clean.

Focus on corners, the bottom edge of the door, and any folds in the gasketthose areas are basically where odor
goes to start a new life.

Step 6: Don’t ignore the sink connection

Many dishwashers drain through the garbage disposal or sink plumbing. If the disposal is funky, that odor can drift
back toward the dishwasher. Before running a cycle:

• Run the disposal with plenty of water (and remove any obvious debris).
• Make sure the disposal isn’t packed with yesterday’s mystery soup.
• Check that the dishwasher drain hose has a proper “high loop” or air gap (often required to prevent backflow).

When to use Way #1: anytime you smell “old food,” “wet dog,” or “why is my kitchen haunted?”

How often: a quick filter rinse monthly is a great baseline; deep-clean as needed when odors appear.

Way #2: Run a Vinegar Cycle, Then a Baking Soda Cycle (The One-Two Punch)

If Way #1 is cleaning the “hardware,” Way #2 is cleaning the “vibes.” White vinegar helps cut grease and dissolve
detergent buildup; baking soda deodorizes and tackles lingering funk. The key: use them in separate cycles
so you don’t create a foamy volcano in your dishwasher.

What you’ll need

• Distilled white vinegar
• Baking soda
• A dishwasher-safe bowl or measuring cup

Step A: Vinegar wash (de-grease and de-gunk)

1. Start with an empty dishwasher.
2. Pour 1–2 cups of white vinegar into a dishwasher-safe container.
3. Place it upright on the top or lower rack (stable is the goal).
4. Run a hot cycle. Skip detergent. If your machine has options, turning off heat-dry can be helpful.

When the cycle ends, crack the door open for a bit to let moisture escape. Your dishwasher should already smell
noticeably betterlike “kitchen appliance” instead of “biology lab.”

Step B: Baking soda rinse (deodorize and brighten)

1. Sprinkle about 1 cup of baking soda across the bottom of the tub.
2. Run a short hot cycle.

Pro tips (because we’re here to win)

• Don’t mix vinegar and baking soda in the same step. It’s fun in a volcano, less fun in a dishwasher.
• If you have hard water, repeat this routine monthly or use a descaling product occasionally (see Way #3), because
  mineral buildup loves to trap greasy residue.
• If your odor is mainly from the gasket, still do a quick wipe-down first. Chemistry is great, but it can’t scrub a
  rubber fold like a human can.

When to use Way #2: when the dishwasher smells “musty,” “stale,” or generally like it needs a shower.

Way #3: The Heavy-Duty Reset (Cleaner Pods, Sanitize Cycle, or BleachCarefully)

Sometimes the smell isn’t just food bitsit’s scale, biofilm, or mildew that’s settled into the nooks and crannies.
That’s when you bring in the big tools: a dishwasher cleaner/descaler, the sanitize setting, or (in specific cases)
a controlled bleach clean.

Option 1: Use a dishwasher cleaner or descaler

Commercial dishwasher cleaners are designed to dissolve greasy buildup and mineral scale more aggressively than
vinegar alone. They’re especially useful if you have hard water, cloudy glassware, or a dishwasher that “cleans”
with all the enthusiasm of a teenager asked to take out the trash.

• Follow the product directions exactly (some go in the detergent cup; others sit in the rack).
• Run an empty cycle, typically on the hottest setting.
• Consider using a cleaner monthly if your water is hard or your dishwasher sees heavy use.

Option 2: Run the sanitize cycle (heat is undefeated)

If your dishwasher has a Sanitize option, use it after you’ve cleaned the filter and removed debris.
High heat can help knock back odor-causing bacteria and mildew. This is a great follow-up when you’ve had a “left
dishes in the closed dishwasher for three days” situation. (No judgment. Life happens. So do smells.)

Option 3: Bleachonly if your dishwasher and manual say it’s safe

Bleach can remove mold and mildew, but it’s not safe for every dishwasherespecially models with stainless steel
interiors or stainless parts that can be damaged by chlorine-based products. If (and only if) your owner’s manual
approves bleach:

1. Make sure the dishwasher is empty.
2. Add a small amount of bleach per your manual’s guidance (different brands/models vary).
3. Run a full cycle.
4. Never use bleach at the same time as vinegar or other acids. (This is non-negotiable.)

If you’re unsure, skip bleach and use a dishwasher cleaner pod + sanitize cycle instead. It’s the safer “reset”
combo for most households.

When to use Way #3: persistent odor, visible mildew, heavy scale, or when vinegar/baking soda didn’t fully solve it.

Keep It Fresh: Odor-Proofing Habits That Actually Work

Once your dishwasher smells normal again, keep it that way with a few small habits that prevent odor from building
up. Think of this as “maintenance,” not “punishment.”

• Scrape, don’t rinse. Remove big food chunks, but don’t obsessively pre-rinse unless your dishwasher/manual recommends it.
• Run hot water at the sink for a few seconds before starting the dishwasher so the first fill is hot.
• Leave the door slightly ajar after the last load of the day to let moisture escape.
• Clean the filter monthly (more often if you cook a lot or load heavily soiled dishes).
• Wipe the gasket every couple of weeksespecially the bottom corners.
• Use rinse aid if you have hard water (it helps reduce filming that traps odor).
• Don’t let dirty dishes marinate for days. If you must, at least run a quick rinse cycle.

The goal isn’t perfection. The goal is avoiding the moment you open the dishwasher and instantly regret having a nose.

Troubleshooting: When the Dishwasher Still Smells (Even After Cleaning)

If you’ve done the three methods and the smell is still throwing a party, here are a few common “next suspects.”

The smell is like rotten eggs

A sulfur/rotten-egg odor can come from bacteria in plumbing, a garbage disposal issue, or occasionally water supply
problems (especially if hot water also smells odd). Clean the disposal, confirm the dishwasher drain hose is
installed correctly, and consider a plumber if the odor seems tied to the home’s water or drains.

The smell returns fast (within a day or two)

That often points to a drain problemstanding water, a kinked drain hose, a clogged air gap, or
backflow from the sink/disposal. Check for standing water after a cycle, and address plumbing issues if needed.

The dishwasher is clean but the dishes smell

That can happen if the spray arms are clogged, the filter is still dirty, or the load is packed so tightly water
can’t reach surfaces. Give dishes breathing room and verify water jets are clear.

If odor persists after you’ve cleaned the filter, drain area, spray arms, and gasketand you’ve run a cleaner pod
cycleyour best next step is checking the manual for drain troubleshooting or contacting service. Some smells are
gunk. Some smells are plumbing. And some smells are your dishwasher quietly asking for professional attention.

Final Thoughts

To clean a smelly dishwasher, you don’t need magicjust the right order of operations:
remove the gunk, deodorize the interior, and reset buildup when needed.
Start with the filter and seals, follow with vinegar and baking soda, and reach for a cleaner pod or sanitize cycle
when odors cling like a bad chorus in your head.

Do those things, and your dishwasher can go back to smelling like… nothing. Which, for an appliance, is the highest
compliment.

Real-Life Dishwasher Funk: of Lessons Learned

I used to think a dishwasher was a self-cleaning miracle box. You load it, press a button, and the appliance fairy
takes care of everything. Then one summer my dishwasher started smelling like hot aquarium water mixed with
leftover lasagna. I did what any reasonable person would do: I stared at it, offended, as if it had betrayed me.

My first mistake was assuming “more detergent” meant “more clean.” Spoiler: it can mean “more residue.” If your
detergent isn’t rinsing awaybecause of hard water, a clogged filter, or overloadingit builds up and clings to the
same places grease clings. That residue becomes the sticky wallpaper that odors move into. Once I stopped treating
detergent like seasoning (“just a little extra for flavor”), the smell improved.

My second mistake was ignoring the filter because I didn’t want to know. The filter felt like something an
appliance tech should handle while wearing gloves and grim determination. Turns out, removing the filter was easy.
The hard part was accepting what I saw. It was a thick, gritty layer of “who knows” that clearly had been there
through multiple presidential administrations. After a hot rinse and a toothbrush scrub, the smell dropped
immediatelylike turning down the volume on a bad song.

Next came the gasket. Nobody talks about the gasket until it’s too late. I wiped the rubber seal and the cloth
came away grayish and greasy, like I had just cleaned the rim of a barbecue smoker. That’s when I realized odor
isn’t always in the “main tub.” It’s in the little folds and corners where water doesn’t blast full force. A baking
soda paste and a gentle scrub made the gasket feel (and smell) normal again.

Then there was the “I’ll do it later” habitloading dirty dishes and letting them sit in a closed, wet environment
for a day or two. That’s basically a spa retreat for bacteria. Once I started running a quick rinse cycle if dishes
had to wait, and cracking the door after the last load, the musty smell stopped coming back.

The biggest lesson: if your dishwasher smells, don’t jump straight to exotic solutions. Start simple. Remove debris.
Clean the filter. Clear the spray arm holes. Wipe the gasket. Then use vinegar and baking soda in separate cycles.
And if your water is hard or the smell keeps returning, don’t be shy about using a dishwasher cleaner or sanitize
cycle. Your goal isn’t to win a purity contest; it’s to stop your dishwasher from smelling like it’s hiding secrets.

These days, I consider “dishwasher smells like nothing” a luxury. It’s right up there with freshly washed sheets,
a phone charger that actually works, and socks that match.