Caught a musty, swampy whiff coming off your fresh laundry? That usually means mold in your washing machine, and it happens more often than you would think, especially in front-loaders.
The good news is you can clear it out yourself in an afternoon with bleach or vinegar and a stiff brush. No repair call, no new appliance.
Below you will find the exact steps for a front-loader, a top-loader, and that grimy detergent drawer, plus the habits that stop the mold from coming back.
Key Takeaways
- Mold grows in the damp, dark parts of a washing machine, mostly the rubber door gasket on front-loaders and the detergent drawer.
- Kill it with diluted chlorine bleach or distilled white vinegar, then run the hottest cycle. Never mix bleach and vinegar, as the fumes are toxic.
- Front-load washers are the worst offenders: 13 percent of owners report mold or mildew, versus 3 percent for high-efficiency top-loaders.
- Prevent regrowth by leaving the door open, wiping the seal dry, and running a monthly tub-clean cycle.
Why Do Washing Machines Get Moldy?
Front-load washers are far more prone to mold than top-loaders, and the numbers back it up. In a 2025 Consumer Reports survey, 13 percent of front-load owners reported mold or mildew buildup, compared with 3 percent of high-efficiency top-loaders and just 1 percent of traditional top-load agitators (1).
The main culprit in front-loaders is the rubber seal, or gasket, around the door. It is built to be watertight during a cycle, which means it also traps water in its folds afterward. A front-loader is basically a closed system: once the door shuts, that trapped moisture cannot dry out, so it turns into a perfect breeding ground for mold. Low water use and cold, eco-friendly wash cycles make things worse, leaving behind detergent residue that mold feeds on.
Top-loaders aren’t immune. Their looser lids let air circulate, but mold still grows under the metal lip of the drum or inside the agitator if you don’t let the basin air out properly.
Is Washing Machine Mold Dangerous?
Yes, having mold in your appliances can impact your health (2). The spores can become airborne or attach to your clothes, leading to exposure even after you leave the laundry room.
Common reactions to mold exposure include irritation of the eyes, nose, throat, and skin. You might experience sneezing, coughing, or rashes. For those with asthma or mold allergies, the reaction can be more severe, potentially triggering asthma attacks or respiratory difficulty.
Vulnerable groups, such as infants, the elderly, and those with compromised immune systems, should be especially careful (3).
While the term “black mold” (Stachybotrys chartarum) sounds scary, many types of mold can grow in washers. Regardless of the species, if it is slimy or fuzzy, it needs to go (4).
Common Causes of Washing Machine Mold
Knowing why the mold appeared is how you stop it from coming back. Here are the five most common reasons your machine starts growing fungi:
- Trapped moisture: Closing the door right after a cycle seals humidity inside. Mold needs moisture to survive, and a wet drum is a perfect habitat.
- Detergent residue: Using too much detergent, or the wrong type (like non-HE soap in an HE machine), creates excess suds. That scum clings to the tub and gasket, trapping dirt and moisture.
- Cold water washes: If you only ever wash cold, detergent residue and bacteria may not rinse away fully, leaving the biofilm buildup that mold feeds on.
- Irregular maintenance: Washing machines need a “bath” too. Skip the monthly self-clean cycle and grime builds up.
- Washing moldy items: Tossing in damp towels that sat in a hamper for a week transfers spores straight into the machine.
How to Clean Mold From a Washing Machine
Ready to scrub? We will break down the process for front loaders, top loaders, and the tricky detergent drawer.
For a heavy-duty clean, bleach is the gold standard as a mold remover. If you prefer a natural approach, distilled white vinegar handles many mold types, though bleach is stronger on stubborn infestations.
- Time: 3 hours (includes soaking time)
- Difficulty: Intermediate
Safety Warning
Mold spores are irritants. Always wear a mask, safety goggles, and rubber gloves when scrubbing. Open windows or turn on a fan to ventilate the room. Keep pets and children away from the area while you work.
What You’ll Need
- N95 mask, goggles, and rubber gloves
- Liquid chlorine bleach OR distilled white vinegar
- Bucket or spray bottle
- Hot water
- Microfiber cloths
- Old toothbrush
- Scrubbing brush
- Dry towel
In a Front Loader Washer
1. Prepare Your Cleaning Solution
Ventilate the room and gear up. Decide on your cleaner.
If using bleach, mix one part bleach to four parts water in a bucket or spray bottle.
If you are cleaning with vinegar, use a 1:1 ratio of vinegar and water.
Caution
NEVER mix bleach and vinegar. This combination creates chlorine gas, which is toxic and can be lethal (5). Pick one cleaner and stick with it for the whole process.
2. Scrub the Gasket
This is the most important step for front loaders. Pull back the rubber folds of the door seal. Spray or wipe your solution generously into the seal. Use an old toothbrush to scrub deep into the crevices where “sludge” collects.
For severe mold, soak a few towels in your solution and stuff them into the gasket folds. Leave them there for 20 to 30 minutes to kill the spores.
3. Scrub the Drum and Door
Dip your brush or cloth into the solution and scrub the inside of the door glass and the drum. Remove the towels from the gasket and give it one final scrub to wipe away the loosened grime.
4. Run a Sanitizing Cycle
Toss the cleaning towels into the drum. Pour ½ cup of bleach or two cups of vinegar into the detergent dispenser. Select the “Sanitize,” “Tub Clean,” or the hottest water cycle available and let it run.
5. Clean the Filter and Drain
Once the cycle ends, remove the towels. Check your drain pump filter (usually a small door at the bottom front of the machine). Open it (have a towel ready for water spills) and clean out any lint, coins, or slime. Rinse the filter in the sink with dish soap before replacing it.
6. Wipe and Dry
Wipe down the exterior and the controls. Finally, use a dry towel to dry the drum and especially the rubber gasket folds. Leave the door open.In a Top Loader Machine
1. Fill and Soak
Set your washing machine to the hottest temperature and the longest cycle. Let the drum fill with hot water.
As soon as it fills, pause the machine. Add 4 cups of distilled white vinegar or 1 cup of bleach. Do not mix them. Let this hot solution sit in the machine for at least one hour.
2. Scrub While Soaking
While the water sits, dip a microfiber cloth or toothbrush into the hot water in the drum. Use it to scrub the top rim of the washer, the lid, and the agitator (if you have one). Mold often hides under the metal lip at the top of the basket, so scrub thoroughly there.
3. Complete the Cycle
After an hour, close the lid and let the wash cycle finish. This flushes the solution through the drum and cleans the drain lines.
4. Wipe Down
Once the cycle is done, take a dry microfiber cloth and wipe out any remaining moisture from the drum and lid.
Cleaning the Detergent Dispenser
Mold loves the detergent drawer because it stays constantly damp and covered in soap scum.
- Remove the drawer: Most drawers have a release tab. Press it and pull the drawer completely out.
- Soak it: Fill your sink with warm water and a cup of vinegar or a splash of bleach. Let the drawer soak for an hour.
- Scrub the housing: While the drawer soaks, look inside the slot where the drawer slides into the machine. This area often has black mold on the “ceiling” of the compartment. Spray your cleaner in there and scrub hard with a toothbrush.
- Clean and dry: Scrub the soaked drawer to remove residue, rinse it, and dry it completely before sliding it back in.
How to Prevent Future Mold Growth
Now that your machine is clean, you want to keep it that way. Prevention is far easier than scrubbing sludge out of a rubber seal.
- Leave the door ajar: This is the number one rule. After every load, leave the door or lid open so the drum can dry out.
- Wipe the seal daily: Keep a towel nearby and quickly wipe the rubber gasket dry after you pull your laundry out.
- Use HE detergent correctly: If you have a high-efficiency washer, only use HE detergent, and don’t use too much. Two tablespoons is usually plenty for a standard load.
- Run a monthly maintenance wash: Once a month, run a “Tub Clean” cycle or a hot wash with a washing machine cleaner tablet (like Affresh) or vinegar to kill spores before they take hold.
- Move wet clothes fast: Don’t let wet laundry sit in the washer overnight. Move it to the dryer or clothesline right away.
- Control humidity: If your laundry room runs damp, consider a dehumidifier or crack a window to improve airflow.
FAQs
Bye, Bye, Mold!
With a bottle of bleach or vinegar and half an hour of scrubbing, you can clear that swampy smell yourself, no repair pro required.
The real secret is keeping the machine dry between loads. Leave the door open, wipe the seal after wash day, and run that monthly tub-clean cycle.
Vinegar is a fine eco-friendly maintainer, but bleach is the stronger option once mold has taken hold. And if you have scrubbed the gasket raw and the black stains still won’t budge, the mold has likely penetrated the rubber, and replacing the seal is your best move.
