Your Washer Is Dirtier Than Your Laundry: How to Clean a Washing Machine the Right Way

To clean a washing machine, run an empty hot cycle with a washer cleaner, chlorine bleach or white vinegar (never mixed together). Then scrub the door gasket, detergent drawer and drain filter, and wipe the drum dry. Most experts recommend doing this about once a month or every 30 loads, with front load washers needing the most attention.

You washed the towels, but they still smell sour. Or you opened the washer door and caught a whiff of something swampy. That smell is not coming from your clothes. It is coming from the machine.

Washing machines clean everything except themselves. Detergent residue, fabric softener, body oils, lint and hard water minerals collect in hidden spots, and in a humid city like Houston, that buildup turns into mildew fast.

This guide walks you through exactly how to clean a front load and top load washer, which cleaners work best, what to avoid, and the simple habits that keep your machine fresh between cleanings.

Why Do Washing Machines Get Dirty?

Washing machines get dirty because every load leaves behind a thin film of detergent, softener, skin oils and minerals, and the warm, damp interior gives mold and bacteria a perfect place to grow.

This slimy layer is called biofilm. It forms where water sits and air does not move, such as under the rubber door seal, inside the detergent drawer, beneath the drum and in the drain pump filter.

A few things make the problem worse:

• Using too much detergent. Extra soap does not rinse away fully and becomes food for mildew.
• Liquid fabric softener. It leaves a waxy coating that traps grime.
• Cold water only washing. Cold cycles save energy but do less to dissolve oily residue.
• Closing the door after every load. Trapped moisture is the main reason front loaders smell.
• Hard water. Mineral scale builds up on the drum and heating element and gives residue something to cling to.

How Do You Know Your Washer Needs Cleaning?

If your clothes come out smelling musty, you see black spots on the door seal, or gray flecks appear on clean laundry, your washer needs a deep clean.

Watch for these common signs:

• A sour, musty or mildew smell when you open the lid or door
• Black or pink spots on the rubber gasket
• Gunk or slime in the detergent or softener drawer
• Dark flecks or residue on freshly washed clothes
• Towels that smell damp even after drying
• Water draining slowly or pooling at the bottom of a front loader
• White crusty scale around the drum or dispenser

If the whole laundry room smells off, the washer may be only part of the story. Our guide on why your house smells musty covers other common sources.

How Often Should You Clean a Washing Machine?

For most households, clean your washing machine once a month or about every 30 loads. Front load washers need monthly care because their airtight doors trap moisture, while top load washers can often go two to three months.

Our take: Families with kids, pets, gym clothes or cloth diapers should lean toward the more frequent schedule. Those loads carry more oils, hair and bacteria into the machine.

What Do You Need to Clean a Washing Machine?

You do not need special equipment. Gather these before you start:

• One cleaning agent: a commercial washer cleaner tablet, liquid chlorine bleach, or distilled white vinegar
• Baking soda (optional, for scrubbing and deodorizing)
• An old toothbrush or small scrub brush
• Microfiber cloths
• Rubber gloves
• A shallow pan and old towels (for the drain filter)
• Your washer’s manual, or the model number so you can look it up online

Important safety note: Never mix chlorine bleach with vinegar, ammonia or other cleaners. Bleach combined with acids or ammonia releases toxic gases. Use one cleaner per cycle, and run a plain rinse cycle before switching to a different one.

How Do You Clean a Front Load Washing Machine?

Clean a front load washer by scrubbing the door gasket, cleaning the detergent drawer, running a hot cleaning cycle with a washer cleaner or bleach, emptying the drain filter, then drying everything and leaving the door open.

Front loaders are the most prone to odor because the rubber gasket seals tightly and holds water. Here is the full process.

Step 1: Clean the Door Gasket

Pull back the rubber seal and look inside the folds. You will likely find hair, lint, coins, and dark mildew spots.

1. Wipe out loose debris with a dry cloth.
2. Spray or wipe the folds with a solution of diluted bleach (follow the label) or a mildew cleaner safe for rubber.
3. Scrub gently with a toothbrush, especially along the bottom where water collects.
4. Wipe clean with a damp cloth, then dry the folds completely.

Stubborn black stains often mean mold has worked into the rubber itself. Cleaning may lighten them but not remove them fully. If the seal is cracked or heavily stained, a replacement gasket is usually the better fix.

Step 2: Clean the Detergent Drawer

Most drawers pull all the way out by pressing a release tab. Check your manual.

1. Remove the drawer and any inserts.
2. Soak them in hot water for 10 to 15 minutes.
3. Scrub off softener sludge and detergent buildup with a brush.
4. Use the toothbrush to clean the drawer cavity inside the machine, where mold often hides on the ceiling.
5. Dry and reinsert.

Step 3: Run a Hot Cleaning Cycle

Use the machine’s built in Clean Washer or Tub Clean cycle if it has one. Otherwise, choose the hottest, longest cycle with an extra rinse.

Add only one of these:

• A washer cleaner tablet placed directly in the drum, or
• Liquid chlorine bleach in the bleach dispenser, filled to the max line, or
• About 2 cups of white vinegar in the detergent dispenser (check your manual first)

Run the cycle empty. No clothes, no detergent.

Step 4: Empty the Drain Pump Filter

Many front loaders have a small access panel at the bottom front. This filter catches lint, hair, buttons and small socks.

1. Unplug the machine.
2. Lay towels down and place a shallow pan under the panel.
3. Open the panel and release the small drain hose first if your model has one, then slowly unscrew the filter. Expect water to come out.
4. Rinse the filter under the tap and clear debris from the opening.
5. Screw it back in firmly to prevent leaks.

A clogged filter is one of the most overlooked causes of washer smell and slow draining.

Step 5: Wipe and Dry

Wipe the drum, gasket and door glass with a dry microfiber cloth. Leave the door and drawer slightly open for several hours so everything dries.

How Do You Clean a Top Load Washing Machine?

Clean a top load washer by filling it with hot water and a cleaner, letting it soak for about an hour to loosen buildup, finishing the cycle, then scrubbing the lid, rim, dispensers and agitator.

Top loaders smell less often, but grime builds up under the rim and around the agitator where you cannot see it.

1. Start a hot fill. Select the hottest water setting, largest load size and longest cycle.
2. Add your cleaner. Use a washer cleaner, about 4 cups of white vinegar, or chlorine bleach according to the label. Choose one, not several.
3. Let it soak. Once the tub fills and agitates for a minute, pause the machine and let it sit for about an hour. The soak does most of the work.
4. Scrub while it soaks. Wipe the underside of the lid, the rim of the tub, and the bleach and softener dispensers. If your agitator has a removable cap or fabric softener cup, pull it off and clean underneath.
5. Finish the cycle. Resume the machine and let it complete.
6. Run a rinse cycle. This clears any loosened debris and leftover cleaner.
7. Wipe and air dry. Dry the tub rim and leave the lid open.

For a deodorizing boost, some people run a second hot cycle with about half a cup of baking soda sprinkled in the drum. It is optional but helpful for stubborn smells.

Vinegar, Bleach, Baking Soda or Washer Cleaner: Which Works Best?

Commercial washer cleaners and chlorine bleach are the most effective for mildew and odor, while vinegar is better for light mineral buildup. Baking soda helps deodorize and scrub but is not a disinfectant.

Practical recommendation: Check your manual first, since some brands specify which cleaners are approved for their machines. If there is no guidance, a washer cleaner tablet for monthly maintenance plus an occasional bleach cycle for mildew is a reliable routine. Save vinegar for scale, especially if your home has hard water. For buildup on faucets and fixtures too, see our guide on how to remove hard water stains.

Which Washer Parts Do People Forget to Clean?

The most forgotten parts are the drain pump filter, the underside of the door gasket, the detergent drawer cavity, the inlet hose screens and the exterior controls.

• Inlet hose filters: Small mesh screens where the water hoses connect can clog with sediment. Turn off the water supply before checking them.
• Lid hinges and door edges: Grime collects where you rarely look.
• Control panel and knobs: A high touch surface, especially in shared laundry rooms.
• Top of the machine: Dust and spilled detergent build up fast.
• Behind and beside the washer: Lint and damp spots can attract mildew and pests.

Why Do Washers Smell Worse in Houston Homes?

Houston’s heat and high humidity slow drying inside the washer, so moisture lingers longer and mildew grows faster than in drier climates.

A few local factors play a role:

• Humidity: Damp air means the drum and gasket take longer to dry between loads, even with the door open.
• Hot laundry spaces: Machines in a garage or warm utility closet sit in heat and moisture for much of the year.
• Storms and flooding: After heavy rain or a flood event, standing moisture around the laundry area can make odor problems worse.
• Hard water in some areas: Mineral scale gives residue more places to stick.

Running a small fan or dehumidifier in an enclosed laundry room can make a real difference. For more humidity tips that protect your whole home, read how to prevent mold in a humid house.

How Can You Keep Your Washing Machine Clean Between Deep Cleans?

Use less detergent, remove wet laundry promptly, wipe the gasket after the last load, and leave the door and drawer open to dry.

These small habits prevent most odor problems:

1. Use the right detergent. HE machines need HE detergent, and usually less than the cap suggests.
2. Move wet clothes right away. Leaving a load sitting for hours encourages mildew in both the clothes and the drum.
3. Leave the door or lid open. Keep it cracked after each use if kids and pets cannot reach it.
4. Dry the gasket. A 10 second wipe after the last load of the day helps a lot.
5. Cut back on liquid fabric softener. Try wool dryer balls or use softener less often.
6. Run a hot cycle now and then. An occasional hot wash helps dissolve oily residue that cold cycles leave behind.
7. Pull the drawer out to dry. Leaving it slightly open lets the cavity air out.

What Are the Most Common Washer Cleaning Mistakes?

• Mixing bleach with vinegar or other cleaners
• Using regular detergent in an HE machine
• Adding more detergent to fix a smell, which usually makes it worse
• Cleaning the drum but skipping the gasket and filter
• Shutting the door tight right after a cleaning cycle
• Using abrasive pads or wire brushes on the drum or glass
• Ignoring the manual’s warnings about certain cleaners
• Assuming a persistent smell is always a cleaning issue

When Should You Call a Professional?

Call an appliance technician if the smell returns within days of a thorough cleaning, the washer drains poorly after you clear the filter, or you notice leaks, error codes or cracked seals.

Some problems go beyond cleaning:

• A clogged or failing drain pump
• A torn or moldy door gasket that needs replacing
• A blocked drain hose or household drain line
• Water leaking under the machine, which can damage flooring

Cleaning the washer is a household task. Repairs, hose replacements and electrical issues are best left to a qualified appliance repair technician.

Key Takeaways

• Clean your washing machine about once a month or every 30 loads, with front load washers needing the most frequent care.
• Biofilm from detergent, softener, oils and minerals is the main cause of washer odor.
• Use one cleaner at a time. Never mix bleach with vinegar, ammonia or other products.
• The gasket, detergent drawer and drain filter are where most smells start.
• Washer cleaner tablets and bleach handle mildew best, while vinegar suits light mineral scale.
• Houston humidity slows drying, so leaving the door open and improving airflow matters even more.
• Persistent odor or drainage problems may need an appliance technician, not just a cleaning.

Frequently Asked Questions

Can I clean my washing machine with vinegar and baking soda together?

It is better to use them separately. When mixed, vinegar and baking soda neutralize each other and lose much of their cleaning power. Run a hot cycle with vinegar first, then a second cycle with baking soda if you want extra deodorizing. Always check your manual, since some manufacturers limit vinegar use on rubber parts.

How do I get rid of the musty smell in my front load washer?

Scrub the rubber gasket and detergent drawer, empty the drain pump filter, then run the Clean Washer cycle with a washer cleaner or chlorine bleach. Afterward, wipe the drum dry and leave the door open. If the smell returns quickly, the gasket may need replacing or the drain may be partly blocked.

Is it safe to use bleach in a washing machine?

Yes, liquid chlorine bleach is safe for most washers when used in the bleach dispenser on an empty hot cycle. Follow the product label and your manual for the amount. Never combine bleach with vinegar, ammonia or other cleaners, and run a rinse cycle before using a different product.

What is the black stuff on my washing machine rubber seal?

The black spots are usually mold or mildew growing in the moisture trapped in the gasket folds. Light spots often wipe off with a diluted bleach solution and a soft brush. If the staining has soaked into the rubber or the seal is cracked, replacing the gasket is the most effective fix.

Do I need to clean a new washing machine?

New machines do not need a deep clean right away, but starting good habits early prevents buildup. Run an empty rinse or cleaning cycle before first use to clear any manufacturing residue, use HE detergent if required, and begin leaving the door open after each load. Schedule your first full cleaning after about a month.

Why do my towels smell bad after washing?

Smelly towels usually point to detergent and softener buildup or a dirty washer. Too much detergent leaves residue that traps bacteria, and fabric softener coats fibers so they absorb less. Clean the machine, cut detergent back to the recommended amount, skip softener on towels, and dry them fully right after washing.

How do I clean a washing machine filter?

On most front loaders, the filter sits behind a small panel at the bottom front. Unplug the washer, place towels and a shallow pan underneath, then slowly unscrew the filter to drain water. Rinse out lint and debris, clean the opening, and screw it back in tightly. Many top loaders have no user serviceable filter.

Does running a hot cycle clean the washer by itself?

A hot empty cycle helps loosen residue, but on its own it rarely removes mildew from the gasket, drawer or filter. For best results, pair a hot cycle with a proper cleaner and hand clean the parts water cannot reach. Think of hot water as the helper, not the whole cleaning job.

Conclusion

A clean washing machine is the difference between laundry that smells fresh and laundry that smells like a damp basement. A monthly cleaning cycle, a quick scrub of the gasket and drawer, and an empty drain filter will solve most odor problems. Add a few daily habits, like leaving the door open and using less detergent, and your machine will stay fresher for longer, even through a sticky Houston summer.

If keeping up with laundry room chores, kitchens and bathrooms feels like too much on top of everything else, MMMaid can help. Our Houston team handles the recurring cleaning so you can spend your time on what matters to you. Get a free quote or call (832) 247 9023 whenever you’re ready.