Why Does My Washing Machine Smell Bad? How to Fix It and Keep It Fresh

If your washing machine smells musty, sour, or like mildew, the cause is almost always trapped moisture combined with detergent residue, lint, and bacteria growing inside the drum, door seal, or drain system. The good news: most washer smells can be eliminated with a good cleaning routine — and prevented from coming back with a few simple habits.

What Causes That Funky Washing Machine Smell?

Modern washing machines — especially high-efficiency (HE) front-loaders — are designed to use less water, which is great for your utility bill but can lead to buildup inside the machine. Here’s what’s usually responsible:

• Mold and mildew on the door gasket. Front-loaders have a rubber seal around the door that traps water, lint, and soap scum. That damp environment is perfect for mold growth.

• Detergent buildup. Using too much detergent — or the wrong kind — leaves a film inside the drum and hoses. Bacteria love to feed on that residue.

• Clogged drain filter or pump. Most front-loaders have a debris filter near the bottom of the machine. If it’s never been cleaned, it can collect lint, hair, coins, and standing water that turns rancid.

• Drum buildup. Even top-loaders can develop a slimy film inside the drum from repeated low-temperature washes.

• Standing water in the door or drum. Closing the door immediately after a wash cycle traps moisture inside, giving mold exactly what it needs to grow.

How to Get Rid of the Smell: Step-by-Step

Whether you’re in Grand Rapids, Kalamazoo, Lansing, or anywhere across West Michigan, this cleaning method works for most washers:

Step 1: Clean the Door Gasket (Front-Loaders)

Pull back the rubber seal around the door and look inside the folds. You’ll likely find dark mold or gunk. Wipe it out thoroughly with a mixture of one part white vinegar and one part water, or use a diluted bleach solution (1 tablespoon bleach per quart of water). Wear gloves and get into every fold of the gasket. This is often the single biggest source of odor in front-load washers.

Step 2: Run a Cleaning Cycle

Most modern washers have a dedicated drum-clean or tub-clean cycle. Use it. Add either:

• Two cups of white vinegar directly into the drum (skip the detergent), or

• A commercial washer cleaning tablet like Affresh or OxiClean Washing Machine Cleaner

Run the cycle on the hottest water setting available. This kills bacteria and dissolves buildup throughout the machine’s internal components.

Step 3: Clean the Detergent Dispenser

Pull out the detergent drawer and soak it in warm soapy water. Use an old toothbrush to scrub out any gunky buildup. Rinse and dry before putting it back. Mold loves to grow here, and it’s easy to overlook.

Step 4: Clean the Drain Filter

Front-loaders typically have a small access panel near the bottom of the machine. Open it, place a shallow pan underneath, and slowly unscrew the filter cap. Water will drain out — sometimes a surprising amount. Pull out the filter, rinse it under running water, and wipe out the filter housing. This step alone can make a dramatic difference in smell.

Top-loaders generally don’t have an accessible filter, but if yours has a lint trap on the agitator, remove and clean it.

Step 5: Wipe Down the Drum and Leave the Door Open

After the cleaning cycle, wipe the inside of the drum dry with a clean cloth. Then leave the door (or lid) open for several hours to let everything air out. Going forward, always leave the door ajar between washes — this single habit prevents most recurring odor issues.

Preventing Washing Machine Smells Long-Term

Cleaning once is great. Keeping the smell from coming back is even better. Here’s what actually works:

• Use the right amount of HE detergent. More soap doesn’t mean cleaner clothes — it means more residue. Use only the amount specified on the label, and make sure you’re using HE-rated detergent in an HE machine.

• Wash at higher temperatures occasionally. Cold-water washes save energy but don’t kill bacteria as effectively. Running a hot wash every few cycles helps keep buildup under control.

• Run a drum-clean cycle monthly. Put a reminder in your calendar. Once a month takes about an hour and saves you from dealing with a seriously funky machine later.

• Don’t leave wet laundry sitting in the machine. Move clothes to the dryer as soon as the cycle ends. Wet laundry sitting in a closed drum accelerates mold growth inside the machine.

• Dry the gasket after each use. Takes 30 seconds with a dry cloth. Completely worth it for front-loader owners.

What If the Smell Is Coming from the Drain?

Sometimes the odor isn’t coming from the machine itself — it’s sewer gas backing up through the drain hose. If you notice a sulfur or “rotten egg” smell (rather than musty or sour), the problem may be in your drain installation. The drain hose should be positioned in an inverted U-shape before entering the standpipe or utility sink, which creates an air gap that prevents sewer gas from flowing back into the machine. If the hose is inserted too deep or lies flat in the drain, gases can migrate into the washer.

This is worth having a professional check if basic cleaning doesn’t resolve the odor.

When to Call a Technician

Most washer smells are a maintenance issue, not a repair issue — but there are times when you need a pro:

• The smell persists after thorough cleaning and drain inspection

• You notice visible mold deep inside the drum that you can’t reach

• Water isn’t draining completely, leaving standing water after each cycle

• The door seal is cracked, torn, or mold has penetrated the rubber beyond surface cleaning

• You smell burning or electrical odors (separate issue — call immediately)

A damaged door gasket typically needs to be replaced rather than cleaned. A clogged drain pump that’s causing slow drainage or standing water may need professional attention to avoid further damage to the machine.

Is It Worth Repairing an Older Washer with Persistent Smell Issues?

If your washer is more than 8-10 years old and requires a significant repair on top of the smell problem, it may be worth evaluating whether repair or replacement makes more sense. We’ve covered that decision in detail in our post on when to repair vs. replace an appliance — the same framework applies to washers. Generally, if the repair cost is more than 50% of the cost of a comparable new machine, replacement often wins.

For other washer issues, check out our guides on what causes a washing machine to leak and why your washer is shaking and vibrating.

HomeHalo Can Help with Washing Machine Repairs in West Michigan

If you’ve cleaned everything and the smell (or the problem behind it) won’t quit, HomeHalo Appliance Repair is here to help. We service washing machines of all makes and models — from LG and Samsung front-loaders to Whirlpool and Maytag top-loaders — across Grand Rapids, Kalamazoo, Lansing, and the surrounding West Michigan area.

Our technicians can diagnose drainage issues, replace worn door gaskets, clear stubborn clogs, and get your washer smelling clean and running right again. We’re a family-owned business, and we stand behind every repair we do.

📞 Call us at (616) 367-5131 or book your appointment online — we make it easy to get your appliances back on track.