Washing Machine Smells Musty: Drum, Gasket and Filter Routine

A musty washing machine smell may come from moisture or residue around the drum, door gasket, lid area or dispenser. Odor alone cannot confirm mold, and front-load and top-load washers hold moisture differently, so the safest first check depends on the design and the exact model manual.

Front-load vs. top-load: different moisture traps

Front-load washers seal water in with a rubber gasket around the door. That gasket folds in on itself, and water, lint, and small items can sit trapped in those folds long after a cycle ends — manufacturer guidance points to the gasket as one of the most common sources of a musty smell. Top-load washers don’t have this gasket, but they trap moisture differently: a lid left closed between loads keeps the tub’s interior from airing out, and the fabric softener dispenser cup can hold diluted residue that doesn’t fully drain.

Both designs can also develop odor from detergent or fabric softener residue building up inside the tub over time, independent of the gasket or lid issue. Some manufacturers recommend a cleaning cycle at a defined interval — Whirlpool, for example, gives roughly monthly or every-30-cycle guidance for some machines — but the schedule and approved product still need to come from the exact model manual.

Where the smell may be coming from

These are common patterns, not a lab-confirmed diagnosis — odor doesn’t reliably tell you whether mold is actually present, so treat this table as a guide for where to look first rather than a certain cause.

Front-load versus top-load safe-check route

Before you start

Least-invasive checks, in order

1. Front-load: wipe the door gasket dry and check the folds for trapped lint, coins, or small clothing items. Remove anything you find and wipe the area with a dry cloth.
2. Top-load: check your lid habits. If the lid has been staying closed between loads, that alone can be enough to cause a musty smell — leaving it open to air out is a common manufacturer recommendation.
3. Clean the detergent or fabric softener dispenser only as the manual describes. Many dispenser parts are removable, while others are not. Follow the model procedure, use the approved cleaner or water temperature, and dry removable parts as directed before reinstalling.
4. Run a manufacturer-approved tub-cleaning cycle. Many washers include a dedicated cycle for this, used with either a washing-machine cleaner product or a bleach solution — check your manual for which your model supports, since not all are bleach-compatible.
5. If your exact model manual identifies a user-accessible pump filter and provides a procedure, follow it precisely: keep the washer off, expect some spilled water, and use a shallow pan and towels. Do not attempt to access a pump filter if your manual doesn’t describe one for your model.
6. After cleaning, leave the door or lid open between loads to let the interior air dry, which is one of the most consistently recommended prevention habits across manufacturers.

What this guide does not do

Odor alone doesn’t confirm whether mold is actually present, and this guide does not attempt to diagnose mold from smell. It also does not cover opening the washer’s panels, accessing the pump itself, reaching behind fixed guards, or diagnosing wiring or motor issues — those are outside a user-serviceable check. If a musty smell persists after the checks above, or if you have reason to be concerned about mold beyond odor, that’s a reasonable point to contact the manufacturer or a qualified appliance technician.

A simple maintenance record

Because the right cleaning interval varies by manufacturer and by how the machine is used, a short written record is more useful than trying to remember when you last cleaned each part. Jot down the date next to each item as you go:

Keeping this on the fridge or in a notes app makes it easy to see at a glance whether a musty smell lines up with a cleaning step that’s overdue.

Maintenance and prevention

• Where the manual permits it, leave the door or lid ajar between loads so the interior can air dry.
• Run a tub-cleaning cycle on the schedule your manual recommends; this commonly ranges from monthly to roughly every 30 cycles, but check your own manual rather than assuming.
• Move wet laundry to the dryer or a line promptly after a cycle ends, since laundry left sitting damp in the machine is a common and avoidable source of musty smell.
• Use the amount of detergent and fabric softener recommended for your load size and water hardness — excess product is a common contributor to residue buildup.

FAQ

Does a musty smell mean my washer has mold?

Not necessarily — odor alone isn’t a reliable way to confirm mold, and there are several other common causes described above. If you’re concerned, cleaning the gasket or tub and reassessing is a reasonable first step before assuming mold is present.

Can I use vinegar to clean my washer?

Some owners do, but check your manual first — not every manufacturer recommends vinegar for every model, and vinegar should never be combined with bleach or ammonia-based products in the same cleaning session.

Is it normal for a front-load washer to smell musty faster than a top-load washer?

Front-load washers’ door gaskets do trap moisture in a way top-load washers generally don’t, which is part of why gasket care gets emphasized specifically for front-load models — but both types can develop odor from residue buildup.

How often should I run a cleaning cycle?

This varies by manufacturer and model — check your manual for the specific interval recommended for your washer rather than assuming a single schedule applies to all machines.

Related checks

If towels specifically keep smelling off even after a normal wash, this guide to towel odor causes looks at detergent, drying time, and washer condition together. And if you’re also noticing a chalky residue on dark clothing from the same machine, this detergent residue guide may be relevant too.

New to RFSE? See how to approach any RFSE guide safely, or browse the full Laundry & Cleaning hub for more guides like this one.

Sources

This guide is based on official manufacturer documentation current as of publication. Gasket design, pump filter access, and approved cleaning products vary by model — always confirm details against your exact washer’s manual.

• Whirlpool — “How to Remove Smells in a Front Load Washer”
• Whirlpool Product Help — “Removing Odors or Smells – Front Load Washer”
• GE Appliances Support — “Top Load Washer – Odor in Tub”