How to Clean Front Load Washer Door Gasket Mold

Grab a phone flashlight and peel back the washer door gasket, the rubber ring around the opening. Black speckling, slime, or a wad of lint and hair in the lowest fold means you've found the source of the smell, and wiping the visible surface won't fix it.

What Causes the Musty Smell in a Front-Load Washer?

A front loader smells musty because water, lint, and detergent residue sit in the door gasket and drain filter, and mold feeds on that film. The tight seal that keeps water in also traps moisture between loads.

The gasket has deep folds so it can flex against the drum, and those folds hold a thin pool of water after every wash. Body oils, fabric softener, and lint give mold something to eat. Too much detergent makes it worse, since high-efficiency machines use little water and can't rinse away the excess. Frequent cold-water washing can leave more residue behind, too.

Not every smell is mold. An earthy odor that is strongest at the door points to the gasket. A sewage or rotten-egg smell, or standing water in the drum after a cycle, points to the drain filter, the drain pump, or a dry trap in the household drain line. Step 3 and the last section help you sort that out.

What Tools and Materials Do You Need?

You need washer cleaner, bleach, a couple of brushes, cloths, and gloves, which runs roughly $10 to $25 if you're starting from scratch.

• Cleaner: washing machine cleaner tablets, or your machine's built-in tub clean cycle
• Bleach: plain, unscented chlorine bleach, or oxygen bleach powder if you'd rather skip chlorine
• Old toothbrush, a soft nylon detail brush, and cotton swabs
• Two or three microfiber cloth squares you can sacrifice
• Rubber gloves, safety glasses, and a window or fan for ventilation
• Shallow baking pan, old towels, and a spray bottle

For most machines, we'd pick the tub clean cycle or a tablet for the drum, then diluted chlorine bleach on the gasket folds. Check your manual first. Some makers specify which cleaners are safe for the gasket, and some caution against frequent vinegar use on rubber. If you want to avoid chlorine, you'll find some cleaners with the EPA Safer Choice label. That label speaks to ingredient standards, not to how well a product kills mold, so read the directions.

Step 1: Run an Empty Hot Cycle With Cleaner

Run the drum empty on the hottest, longest setting with a washer cleaner, which loosens the film inside the drum and hoses before you scrub by hand.

1. Empty the drum completely, including stray socks lodged in the gasket folds.
2. Put a cleaner tablet in the drum or dispenser per the package directions. Or add chlorine bleach to the dispenser at the amount your manual specifies.
3. Select the tub clean cycle if you have one. If not, pick the hottest setting, usually sanitize or heavy-duty.
4. Let it finish, then leave the door wide open.

One cleaner per cycle is plenty. If you used bleach, don't follow it with a vinegar cycle the same day.

Step 2: Pull Back and Scrub Every Fold of the Gasket

Pull the rubber back fold by fold and scrub inside each one, because the worst mold sits where you can't see it.

1. If you used a tablet in Step 1, wipe the folds with plain water first. Some tablets are acidic and shouldn't meet bleach.
2. Fill a spray bottle with diluted bleach, no stronger than about 1 cup of chlorine bleach per gallon of water. Weaker works for light mold. For a chlorine-free route, dissolve oxygen bleach in hot water per the label.
3. Put on gloves and glasses, and open a window.
4. Pull the gasket away from the opening with one hand and work the full circle, flashlight in the other.
5. Lift out lint and hair with a dry cloth first. Scrubbing wet lint just spreads it.
6. Spray the folds and the lip where the gasket meets the drum. Press a soaked cloth into the lowest fold and leave it about 10 minutes.
7. Scrub with the toothbrush, then the detail brush for deep creases. Cotton swabs reach the narrow spots.
8. Wipe with a cloth dampened with plain water until it comes away clean, then dry every fold. Moisture left behind restarts the problem.

Skip steel wool, wire brushes, and abrasive powders. They score the rubber, and scratches give mold a rougher surface to grip. If you spot a small drain hole at the bottom of the gasket, poke it clear with a cotton swab.

Step 3: How Do You Clean the Pocket Drain Filter?

The pocket drain filter is a small trap behind a panel at the bottom front corner of the washer, and it collects water, hair, lint, and lost coins that you clear by unscrewing it.

Look for a small square or round access panel near the floor, on the left or right. Some models hide a short emergency drain hose behind it. A few models have no user-serviceable filter at all, so check the manual if you can't find one. Then work in this order:

1. Unplug the washer. Water and electricity share this space.
2. Lay towels down and set the shallow pan under the panel. Expect anywhere from a cup or two to several quarts, more if the drum didn't drain fully.
3. If there's a drain hose, pull it out, uncap it, and let the water run into the pan. Empty the pan as needed.
4. Turn the filter cap counterclockwise a quarter turn at a time so water seeps out rather than gushing.
5. Pull the filter and clear out hair, lint, buttons, coins, and sludge. Rinse it and scrub the threads with the toothbrush.
6. Shine the flashlight into the housing and gently spin the small impeller blades if you can reach them. They should turn with light resistance. If they're stuck, see the last section.
7. Reinstall the filter clockwise, starting it straight so the threads don't cross. A crooked filter leaks. Close the panel and plug the washer in.

Repeat this front load washer pocket drain filter cleaning every one to three months, sooner in homes with pets or heavy lint. Once you know where it is, it takes about 10 minutes.

Step 4: Clean the Door Glass, Detergent Drawer, and Drum

Wipe the door glass, detergent drawer, and drum too, because mold left in those damp spots can re-seed the gasket within weeks.

Clean the glass and the inside edge of the door with the bleach solution or a mild cleaner, then rinse. Most drawers have a release tab, so check your manual before pulling yours. Soak the drawer in hot water with a little dish soap, scrub off residue with the toothbrush, and rinse. Then shine the flashlight into the empty cavity, which is often furry with mold. Scrub it and wipe it dry.

To clean the front load washer drum itself, a damp cloth and mild cleaner are enough if the first hot cycle was thorough. Leave the door and drawer open to dry.

How Do You Keep Mold From Coming Back?

Leave the door and detergent drawer open after every wash so the washer can dry out. We'd rank that habit above any cleaner you can buy.

If the door has to stay shut because of a toddler or a curious cat, prop it open a couple of inches with a rolled towel placed so it can't fall into the drum. Wipe the lowest gasket fold with a dry cloth after your last load of the day. It takes 20 seconds.

Measure detergent, use high-efficiency detergent only, and go easy on fabric softener, which leaves a film that holds moisture. Don't leave wet laundry sitting in the drum. Run a hot cleaning cycle about once a month; check care labels before washing clothes hot, but an empty cleaning run is fine. A small fan or dehumidifier helps in a damp laundry room.

When Should You Stop Cleaning and Call a Repair Pro?

Stop scrubbing and call a pro when the gasket is cracked or torn, when stains remain after two full cleanings, or when the washer won't drain.

A replacement gasket part typically runs about $50 to $200, and the installed price depends on the brand, the washer's age, and how hard the part is to reach. The job often means removing a clamp spring and sometimes the front panel, which is where most DIY mistakes happen. We'd hire it out unless you're comfortable working around the drum.

As a rule of thumb, if the washer is more than about 10 to 12 years old and the repair quote approaches half the price of a new machine, replacing it may make more sense. If you buy new, you can check models for recalls at the U.S. Consumer Product Safety Commission site.

If you smell sewage but the washer drains fine, the culprit may be a dry trap or the household drain line rather than the machine. Call a plumber, not an appliance tech.

Your next step: set a phone reminder for the first of the month to run a hot cleaning cycle and check the pocket drain filter.