Where mold grows in a washing machine and why
Mold in a washing machine usually lives in three places: the rubber gasket around the door, the detergent dispenser drawer, and the drum itself. These spots stay damp between cycles because water pools there and air does not circulate well. Front-load washers are more prone to mold than top-loaders because the door seals tightly and traps moisture.
The gasket is the worst offender. It is a rubber ring that creates a watertight seal, and lint, soap residue, and water collect in its folds. Once mold takes hold, it spreads quickly because the warm, dark, wet environment is exactly what mold needs. You will notice a musty smell coming from the machine or from your clothes after a wash cycle.
Mold does not mean your machine is broken or that you have failed to clean it. It is a natural result of how washing machines work. The good news is that removing it is straightforward and does not require replacement parts or a service call.
Key Takeaways
- Mold grows in the rubber gasket, detergent drawer, and drum because these areas stay wet and do not dry quickly between cycles.
- White vinegar or a commercial mold cleaner can kill mold on the gasket and inside the drum without damaging the machine.
- A hot water cycle with vinegar or bleach run empty will clean the inside of the drum and kill mold spores.
- Leaving the door open after every wash and wiping the gasket monthly will prevent mold from returning.
Cleaning the rubber gasket
The gasket is where you will see and smell mold most often. Start by pulling back the rubber ring gently and looking inside the folds. You will likely see black or pink spots, or a slimy film. Use a damp cloth or an old toothbrush to wipe out the visible mold. Do not be afraid to scrub — the gasket is tough and can handle firm pressure.
After you have removed the visible mold, soak the gasket with white vinegar or a spray bottle of diluted bleach (one part bleach to ten parts water). Let it sit for 10 to 15 minutes, then scrub again with the cloth or toothbrush. Rinse thoroughly with clean water. If the smell lingers, repeat the process. For stubborn mold, you can also use a commercial mold and mildew spray — follow the product instructions and make sure to rinse well so no chemical residue stays on the gasket.
Running a cleaning cycle through the drum
After you have cleaned the gasket, run a hot water cycle with the machine empty to kill mold spores inside the drum and pipes. You have two options: pour two cups of white vinegar into the detergent dispenser, or use one cup of bleach. Do not mix them — use one or the other.
Set the machine to the hottest water temperature and the longest cycle available. Let it run all the way through. The heat and the vinegar or bleach will kill mold throughout the interior. If your machine has a "clean drum" or "sanitize" cycle, use that instead — it is designed for this exact purpose and may run hotter or longer than a regular wash.
After the cycle finishes, run a second hot water cycle with nothing in it to rinse out any remaining vinegar or bleach smell. Your clothes will not smell fresh if you skip this step.
Cleaning the detergent dispenser drawer
Pull out the detergent drawer — most machines have a button or a small lever to release it. Rinse it under hot running water to remove loose mold and soap buildup. If you see black spots or slime, scrub it with an old toothbrush and white vinegar or diluted bleach, the same way you cleaned the gasket.
While the drawer is out, look at the slot where it slides in. Mold can grow there too. Use a damp cloth or a small brush to clean inside the slot. Dry everything thoroughly before you put the drawer back in. If water sits in the drawer or slot, mold will return quickly.
Preventing mold from coming back
The single most important step is to leave the door open after every wash. Mold cannot grow without moisture, and an open door lets the gasket and drum dry out. Leave it open for at least an hour, or overnight if you have the space. This one habit will stop most mold problems before they start.
Wipe the gasket with a dry cloth once a month, even if you do not see mold. This removes the moisture and lint that mold feeds on. Use a hot water cycle with vinegar once a month as a preventive measure — you do not have to wait until mold appears.
Do not leave wet clothes in the machine. Mold can start growing on fabric in as little as 24 hours, and the damp environment inside the closed machine speeds that up. If you forget a load, run it through a rinse cycle as soon as you remember, then dry it right away.
When to call a repair technician
If you have cleaned the gasket, run multiple vinegar cycles, and the smell still will not go away after a week, the mold may have spread to places you cannot reach — inside the pump, the hoses, or behind the drum. A technician can take apart the machine and clean those areas, or replace the gasket if it is damaged beyond cleaning.
If the gasket is cracked, torn, or has chunks missing, it will not seal properly and water will leak. Replacement gaskets are available for most machines and cost between $50 and $150 plus labor if you hire someone to install it. This is still much cheaper than replacing the whole machine.
Frequently Asked Questions
Is mold in a washing machine dangerous?
Mold spores are not dangerous for most people, but they can irritate skin or trigger allergies in sensitive individuals. If you or someone in your household has asthma or a mold allergy, clean the machine as soon as you notice a smell. For most people, the main problem is the musty odor on clothes.
Can I use bleach and vinegar together to clean the machine?
No. Mixing bleach and vinegar creates toxic chlorine gas. Use one or the other, never both. Vinegar is safer if you have children or pets in the house, and it works just as well for mold removal.
How often should I clean my washing machine to prevent mold?
If you leave the door open after every wash and wipe the gasket monthly, you should not see mold. If you tend to close the door right away or live in a very humid climate, run a vinegar cycle once a month as a preventive step. You do not need to do this if mold is not a problem for you.
Will mold come back after I clean it?
It will if the conditions that caused it return — a closed door, standing water, or high humidity. Once you start leaving the door open and drying the gasket regularly, mold usually does not come back. If it does, it means something is trapping moisture, like a broken door latch or a clogged drain.
Can I use a commercial mold killer instead of vinegar or bleach?
Yes. Products made for mold removal in bathrooms work on washing machine gaskets. Follow the label instructions, scrub well, and rinse thoroughly so no chemical stays on surfaces that touch your clothes. Vinegar and bleach are cheaper and work just as well.