Mold in Washing Machine: Gasket, Drawer, Filter, Brand Fixes

What you are looking at inside the washer

Whirlpool's gasket guide says softener and detergent residue builds up on the gasket and can show as black gunk on the seal. LG’s help article is titled after stains and mold in the door gasket, and the Sixth Circuit opinion of 18 July 2013 records that Whirlpool engineers expected owners to notice black mold on the bellows or inside the detergent dispenser. The dark ring in the boot fold may be growth, residue or both, and the cleaning answer is the same.

What you see	Where	What it usually is	Basis
Black or grey speckling in the boot fold	Door gasket, bottom	Growth on trapped water and residue	LG; Sixth Circuit record
Grey or black slime in drawer corners	Dispenser	Soap residue colonised by growth	GE
Dark film that wipes off in one pass	Gasket lip and folds	Detergent and softener buildup	Whirlpool
Standing water in the fold after a cycle	Bottom of the boot	The condition that feeds growth	LG: moisture cannot dry with the door closed
Musty laundry, nothing visible	Sump, pump filter, drain hose	Buildup out of sight	Samsung: uncleaned pump filter causes odors
Wet or swollen flooring beside the machine	The floor	A leak, a different problem	IBHS; see the leak section

Why front load washer mold is more common than top-loader mold

The Sixth Circuit opinion of 18 July 2013 put it plainly: all washers can develop some mold or mildew, but front-loaders promote it more readily “because of the lower water levels used and the higher moisture content within the machines, combined with reduced ventilation.”

Add the door. LG says that when it stays closed, moisture cannot dry and mold may form inside the gasket. Then the soap: Whirlpool product help says use only HE detergent, because non-HE detergent or too much of it causes excessive suds, and GE says use the minimum recommended amount. Even the cleaning cycle reflects the design: Samsung puts Self Clean at about 4 hours on a front-loader against about 1 hour on a top-loader, and reminds front-load owners after 40 washes rather than 20. Top-loaders do grow mold, but they lack the boot fold and their lids tend to stay up.

The five wet places, and why a cycle misses three

The Sixth Circuit opinion lists where the plaintiffs’ experts found residue and growth: the sump area, the pump strainer and drain hose, the door gasket area, the air vent duct and the detergent dispenser duct. When Whirlpool had owners lift the gasket, the opinion says, the common finding was water, detergent and softener deposits with mold or mildew on them.

Part	Why it stays wet	Cycle reaches it?	What reaches it
Door boot fold	Rinse water pools at the bottom	Partly; residue survives	Hand scrub, towel dry
Drawer and duct	Wet residue, drawer shut	No	Remove, soak, brush
Sump and pump filter	Holds water between cycles	No	Open and clean the filter
Drain hose	Residue film inside	Partly	Cycle plus a clear filter
Drum and outer tub	Thin residue film	Yes	The brand’s cleaning cycle

Washing machine gasket mold: what each manufacturer says

Each brand’s cycle, frequency and gasket method, from its own support pages. The brands do not agree on bleach.

Brand	Cycle name	Frequency	Gasket method	Source
Whirlpool (front load)	Clean Washer, with affresh or liquid chlorine bleach	Cycle monthly; gasket deep clean monthly or every 30 cycles	3/4 cup (177 mL) liquid chlorine bleach in 1 gallon (3.8 L) warm water, wipe, leave about 5 minutes, scrub, rinse, towel dry	Whirlpool product help; Whirlpool's gasket guide
LG (front load)	Tub Clean, with a tub cleaner per its package	Monthly; weekly for 3 weeks if a musty smell exists	5 g oxygen bleach in 5 L warm water, at least monthly; the maintenance article also gives 3/4 cup chlorine bleach per gallon or vinegar, never both	LG's gasket help article; LG's front load maintenance article
Samsung (US)	Self Clean, Self Clean+ or Pure Cycle; no cleaner needed	Monthly; reminder after 40 washes front, 20 top	Not on the US pages; Samsung Canada says pull back the boot, wipe the folds with warm water and mild soap, dry	Samsung's US cleaning page; Samsung Canada
Samsung (Australia)	Drum Clean or Drum Clean+ (fixed 70 C)	Monthly	Non-abrasive household detergent; warns chlorine bleach or other cleaners may deform the seal	Samsung Australia
GE	Hottest, longest cycle with two cups of white vinegar	Not stated	Hot soapy water and a rag; toothbrush and white vinegar on stubborn spots; dry with the door open	GE Appliances Factory Service

Two warnings cross brands. LG says never use bleach and vinegar together. Whirlpool says not to use thickened, easy-pour or no-splash bleach in Clean Washer, because excess suds may form. Whether either chemical kills growth or only removes it is covered in does bleach kill mold and does vinegar kill mold.

The method, part by part

Clean the parts a cycle cannot reach first, then run the cycle to flush what you loosened.

• 1. Unplug and drain. LG starts with the washer off and unplugged, the bottom panel open and the remaining water drained into a shallow pan. Why this differs: generic advice skips the filter, which holds standing water.
• 2. Clean the pump filter. Twist it out, brush it in warm water, refit it fully tight, per LG; Samsung says an uncleaned filter causes odors. Why this differs: no cycle opens it.
• 3. Pull the drawer. GE soaks a removable dispenser in equal parts hot water and white vinegar; LG brushes the tray, its underside and the housing. Why this differs: the duct behind it is named in the court record.
• 4. Scrub the boot fold by hand. Fold it back, remove coins and lint as Whirlpool directs, then use your brand’s method. Why this differs: a cycle wets the fold without scrubbing it, and bleach can deform some seals.
• 5. Run the cycle empty. Samsung says never run Self Clean with laundry in the tub. Why this differs: the cycle is the final flush, not the fix.
• 6. Dry it and leave it open. Towel the boot and glass and leave door and drawer open, as LG and Samsung instruct. Why this differs: a shut door put the water there.

Growth that has spread onto drywall or flooring is a building job; the general method and size threshold are on DIY mold remediation, and the mold hub covers other rooms.

The Duet litigation: what the court record says

The multidistrict case ran from 2008 to 2016. Its most quoted lines are plaintiffs’ evidence, and the only trial ended in Whirlpool’s favour.

Describing the record at class certification, the Sixth Circuit opinion of 18 July 2013 recounts internal Whirlpool documents stating that 35% of Duet customers had complained about odor, according to the opinion, and over 1.3 million complaint calls by late 2006. It quotes a 2004 engineering memo saying mold growth “occurs under all/any common laundry conditions.” These were allegations, not findings.

Date	Event	Source
September 2003	Owners begin calling about mold, two to three calls a day	Sixth Circuit
18 July 2013	Liability-only class affirmed on remand from the Supreme Court in light of Comcast v. Behrend	Sixth Circuit
Late October 2014	Ohio jury clears Whirlpool after a three-week trial; class of about 150,000 Ohio buyers, according to Reuters	Reuters via Carrier Management
18 April 2016	Settlement signed with Whirlpool and Sears	Approval order
11 May 2016	Preliminary approval	Approval order
23 September 2016	Final approval	Class counsel
11 October 2016	Claim deadline	Class counsel

According to the preliminary approval order, about 5,500,000 Whirlpool, Kenmore and Maytag front-loaders made from 2001 through 2010 fall in the class, and the defendants deny any wrongful act. The tried case was an issues class, according to Skadden, certified only to decide whether the machines had a defect making them more prone to mold. The jury said no. This page reports only the Whirlpool case, whose court documents were read for it.

Who qualified	What the settlement offered
Every class member	A 5% cash rebate on certain new Whirlpool-built washers or dryers, per the order
Persistent odor or mold within 5 years of purchase	One of: $50 cash, a 20% rebate, or up to $500 of documented repair or replacement cost, per the order

When the washer floods the floor instead

The IBHS washing machine claims study reviewed 525 washer claims from a multi-company homeowners’ insurance sample. According to IBHS, washer failures rank among the top 10 sources of residential water losses, averaging $5,308 after the deductible; supply hoses caused more than half, and overflows and drain line failures another 28%, the study reports.

IBHS also reports an average hose age at failure of 8.7 years, and says about 6% of failures happened in unoccupied homes, where claims ran nearly two and a half times more severe.

IBHS guidance	2012 release	Later guidance page
Replace supply hoses	Rubber hoses every three years	Every five years, even with no visible wear
Hose type	Consider braided steel	Reinforced steel braided over rubber
Valves	Off when away for an extended period	Off when not in use; consider a single-lever ball valve
Inspection	Not stated	Monthly, hot and cold lines

Under a laundry the water goes down. Vinyl and laminate hold it against the deck; drying it is on subfloor water damage. EPA says dry water-damaged areas within 24 to 48 hours, and how long mold takes to grow after water damage explains why. Coverage questions are on homeowners insurance and water damage.

Which situation are you in

Situation	Likely source	Do this	Escalate if
Musty laundry, nothing visible	Pump filter, sump, drain hose	Clean the filter, run the brand cycle	Smell survives LG’s three weekly Tub Cleans
Black ring in the boot fold	Trapped water and residue	Hand scrub per brand, dry, door open	Returns within weeks, or the boot is torn
Slime in the drawer	Drawer and duct	Remove, soak, brush	Growth visible in the duct
Water on the floor after cycles	Boot, filter cap, drain hose	Stop using it, find the leak, dry the floor	Flooring soft, lifting or stained
Burst hose	Supply hose	Shut both valves, extract, call for drying	Water under flooring or in another room
Growth on the wall or floor behind it	Long-running leak	Treat as a building mold job	Over about 10 sq ft, per EPA

Escalation triggers

• The smell is in the room, not just the laundry: suspect the floor, wall or subfloor.
• Flooring beside or behind the washer is soft, cupped or lifted.
• A boot tear or a weeping filter cap. LG says filter care matters partly to keep the unit from leaking.
• Original hoses on a machine eight or more years old, the band IBHS flags.
• Growth returns within weeks of a full clean. LG’s answer is a repair request.

For contractors: the laundry room loss

Growth inside the appliance is owner maintenance. A leak into the floor assembly is a water loss: expect questions on source and duration.

Item	What to record	Why the adjuster asks
Source	The failed hose, cap or boot tear, photographed in place	Sudden discharge and long-term seepage are treated differently
Duration	Staining, rot and growth extent on the deck	Forms exclude repeated seepage over a stated period
Hose and machine age	Hose type, date stamp, model	Hose age drives failures in the IBHS study
Moisture map	Deck readings, adjacent rooms	Sets drying and tear-out scope

On duration, the Eighth Circuit, Croxdale v. Travelers (2026) quotes a generic Travelers form excluding loss from constant or repeated seepage or leakage “that occurs over a period of 14 days or more,” and an Iowa endorsement substituting “weeks, months, or years.” Wording varies; owners should read their policy and ask their state insurance department or a licensed professional, and contractors should record evidence of duration.

Questions people actually ask

Is mold in a washing machine harmful?

To the machine and your laundry, yes: Samsung and LG tie buildup to odors that transfer to clothes, and growth in the boot fold returns if it is not dried. Personal health questions belong with a doctor; CDC and EPA publish general mold guidance. Either way, clean the boot, drawer and pump filter and keep the door open.

Can a moldy washing machine be fixed?

Usually. Every major brand publishes a routine: hand clean the boot, soak the drawer, clean the pump filter, run the cleaning cycle. LG says run Tub Clean weekly for three weeks if a musty smell exists. A torn boot, or growth back within weeks, is a repair call.

Will mold wash out in the washing machine?

Not with ordinary loads. A normal cycle wets the boot fold and drawer without scrubbing them and never opens the pump filter. Brands publish a separate drum cycle, such as Whirlpool’s Clean Washer, LG’s Tub Clean and Samsung’s Self Clean, plus hand cleaning for the rest.

How do I tell if there is mold in my washing machine?

Pull back the bottom of the door boot and look in the fold, check the detergent drawer’s corners, and smell clean laundry straight from the drum. A musty smell with nothing visible usually points at the sump or pump filter, which Samsung says cause odors when not cleaned.

My washer smells musty. What is causing it?

It seals shut and uses little water, so moisture and residue stay in the boot fold, drawer and sump. Whirlpool blames detergent and softener residue and says use only HE detergent; GE adds use the minimum dose, remove wet clothes promptly and leave the door ajar.

Should I use bleach or vinegar on the washer gasket?

Follow your brand. Whirlpool and LG publish a chlorine bleach wipe of 3/4 cup per gallon of warm water, LG’s gasket article uses oxygen bleach, GE uses soapy water and vinegar, and Samsung Australia warns bleach may deform the seal. LG says never combine bleach and vinegar.