Nothing ruins the excitement of opening a freshly cleaned dishwasher quite like a nasty smell hitting you in the face. You expect sparkling dishes, not an odor that makes you wonder if something crawled inside and never came back. If your dishwasher smells funky, the filter probably deserves the blame.
I learned this lesson the hard way after trying every dishwasher cleaner I could find. Guess what actually solved the problem? A five-minute filter cleaning. Sometimes the simplest fix wins, and honestly, that's pretty satisfying.
In this guide, I'll show you how to clean a smelly dishwasher filter, explain why it starts smelling in the first place, and share a few easy habits that keep those unpleasant odors away.
Why Your Dishwasher Filter Smells So Bad
Your dishwasher filter catches food particles before they clog the drain. That's great for your plumbing, but not so great when bits of pasta, grease, rice, and mystery leftovers decide to stay there for weeks.
The longer food sits in a warm, damp environment, the more bacteria and mold grow. The result? A sour, rotten smell that spreads every time you run a cycle.
Ever wondered why your dishes still smell weird after washing? That's usually your first clue that the filter needs attention.
Common Causes of a Smelly Dishwasher Filter
Several things contribute to the odor:
Food debris trapped in the filter
Grease buildup
Mold and mildew growth
Hard water deposits
Running only short or cold cycles
Not cleaning the filter regularly
None of these problems require expensive repairs. They just need a little attention before they become bigger headaches.
How Often Should You Clean a Dishwasher Filter?
Here's the good news—you don't need to clean it every week.
For most households:
Once a month works well for average use.
Every two weeks helps if you cook daily.
Weekly makes sense for large families or heavy dishwasher use.
IMO, monthly cleaning takes so little effort that it's easier than dealing with mysterious kitchen odors later. :)
What You'll Need
Before you start, gather a few simple supplies.
Warm water
Dish soap
Soft sponge
Soft toothbrush
Microfiber cloth
White vinegar (optional)
Baking soda (optional)
That's it. No fancy cleaners or expensive gadgets required.
Step-by-Step: How to Clean a Smelly Dishwasher Filter
Cleaning the filter looks intimidating until you actually do it once. After that, you'll wonder why you waited so long.
Step 1: Turn Off the Dishwasher
Safety first.
Open the dishwasher and pull out the bottom rack to give yourself plenty of room to work.
Step 2: Locate the Filter
Most dishwasher filters sit at the bottom of the tub beneath the spray arm.
You'll usually see:
A cylindrical filter
A flat mesh filter underneath
Many models twist counterclockwise for easy removal.
Step 3: Remove the Filter
Turn the filter gently and lift it out.
Don't force anything. Manufacturers design most filters to come out easily. If yours feels stuck, check your owner's manual before wrestling with it like you're opening a stubborn pickle jar.
Step 4: Rinse Away Loose Debris
Run warm water over the filter.
You'll probably see bits of food wash away immediately. Fair warning: this part isn't glamorous, but it gets satisfying fast.
Step 5: Scrub the Filter
Add a few drops of dish soap.
Use your toothbrush to scrub:
The mesh screen
Small crevices
Plastic frame
Bottom edges
Avoid wire brushes or abrasive scrubbers. They can damage the fine mesh.
Step 6: Remove Stubborn Odors
If the smell sticks around, soak the filter.
Mix:
Warm water
One cup of white vinegar
Let the filter soak for about 20 minutes.
For extra deodorizing power, sprinkle a little baking soda over the filter before giving it one final rinse.
Step 7: Clean the Filter Housing
Don't stop with the filter.
Grab a damp sponge and wipe inside the filter compartment.
Food often hides underneath the filter, and leaving it there defeats the whole purpose.
Step 8: Reinstall the Filter
Place the filter back into position.
Twist it until it locks securely.
Give it a gentle tug to confirm it sits properly before replacing the bottom rack.
Other Parts That Can Cause Dishwasher Odors
Sometimes the filter isn't the only culprit.
Spray Arms
Food particles clog spray arm holes surprisingly often.
Remove them if your model allows it and rinse away debris with warm water.
Door Gasket
The rubber seal around the door traps moisture and grease.
Wipe it with warm, soapy water every few weeks.
Drain Area
Look inside the dishwasher's drain for food scraps.
Removing visible debris helps prevent future smells.
Natural Ways to Freshen Your Dishwasher
You don't always need commercial cleaning products.
I usually rotate between these simple methods because they work well and cost almost nothing.
White Vinegar Wash
Place a dishwasher-safe bowl filled with white vinegar on the top rack.
Run a hot cycle without dishes.
The vinegar helps dissolve grease and neutralize odors.
Baking Soda Refresh
After the vinegar cycle finishes, sprinkle one cup of baking soda across the dishwasher floor.
Run a short hot cycle.
Your dishwasher should smell noticeably fresher afterward.
Lemon
Some people toss lemon slices into the dishwasher.
They leave a pleasant scent, although they won't replace regular cleaning. They work best as a finishing touch.
Mistakes to Avoid
People sometimes create bigger problems while trying to clean their dishwasher.
Avoid these common mistakes:
Ignoring the filter for months
Using bleach on stainless steel interiors
Scrubbing with steel wool
Forgetting to clean the filter housing
Using too much detergent
Skipping hot water cycles entirely
Small habits make a big difference over time.
How to Prevent Dishwasher Filter Smells
Cleaning solves today's odor.
Good habits stop tomorrow's odor.
Scrape Plates First
You don't need perfectly clean dishes before loading them.
Just scrape large food pieces into the trash.
Your filter will thank you.
Run Hot Cycles Occasionally
Hot water dissolves grease much better than cool water.
If you mostly use eco cycles, run a hot cleaning cycle every few weeks.
Leave the Door Slightly Open
After each wash finishes, crack the dishwasher door open.
Air circulation reduces moisture, which slows mold growth.
Clean the Filter Monthly
This simple habit prevents almost every odor problem.
Set a reminder on your phone if you tend to forget. Future you will appreciate it.
Signs Your Dishwasher Filter Needs Cleaning
Not sure whether it's time?
Watch for these warning signs:
Bad smell when opening the dishwasher
Food particles left on dishes
Cloudy glasses
Standing water at the bottom
Longer wash cycles
Poor cleaning performance
These symptoms usually appear before bigger issues develop.
When Cleaning Doesn't Fix the Smell
Sometimes the filter isn't responsible.
If odors continue after a thorough cleaning, check for:
A clogged drain hose
Standing water
Mold inside hidden components
Garbage disposal buildup (if connected)
Plumbing drain problems
Persistent smells may require a deeper inspection or professional service.
Is It Safe to Run a Dishwasher With a Dirty Filter?
Technically, yes.
Should you? Probably not.
A clogged filter reduces cleaning performance and encourages bacteria growth. Over time, it can also strain your dishwasher's drainage system.
Cleaning the filter regularly protects both your dishes and your appliance.
Final Thoughts
Learning how to clean a smelly dishwasher filter ranks among the easiest home maintenance jobs you'll ever tackle. The entire process usually takes less than 15 minutes, yet the results feel surprisingly dramatic.
I make filter cleaning part of my monthly routine because it keeps my dishwasher running efficiently and my kitchen smelling fresh. Plus, I'd rather spend a few minutes cleaning a filter than wondering why my "clean" dishes smell suspicious. FYI, your nose usually notices the difference immediately.
If your dishwasher has started smelling less like fresh dishes and more like yesterday's leftovers, don't ignore it. Grab some warm water, a toothbrush, and a little dish soap. Your dishwasher—and everyone eating off those dishes—will appreciate the effort.
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