Why Front-Loaders Are Prone to This
Front-load washers are more water-efficient and gentler on clothes than top-loaders, but they have a design trait that creates this exact problem: the door seals completely to prevent leaks.
That watertight seal is great during a wash cycle. But after the cycle ends, if you close the door, you've created a warm, dark, airtight chamber with residual moisture clinging to every surface. Mold and mildew thrive in exactly these conditions. Within days, a biofilm of mold begins growing inside the rubber door gasket, on the drum surface, and in the detergent dispenser.
Once that mold colony establishes itself, it transfers a musty or sour smell to every load of laundry you wash. Your clothes go in dirty but dry, and come out clean but smelling like a damp basement.
If your washing machine already smells like sewage, the problem may have advanced beyond just mold — but the cleaning process is similar.
Deep-Cleaning the Machine
Preventing the Smell From Coming Back
Cleaning solves the immediate problem, but if you don't change the conditions that caused it, the mold will return within weeks.
Leave the door open after every load. This is the single most important habit change. After removing your clothes, leave the washer door ajar so air circulates and the drum dries out. Even a couple of inches open makes a significant difference. If you have small children or pets and can't leave the door wide open, crack it as much as safely possible.
Leave the detergent dispenser open too. Pull the drawer out slightly after each load so it can air dry.
Wipe the gasket after each use. Take 30 seconds to run a dry cloth around the inside of the door gasket after every load. This removes the trapped water that mold needs to grow. It becomes second nature quickly.
Use the right amount of detergent. Excess detergent doesn't rinse out completely and leaves a residue on the drum and gasket that feeds mold and bacteria. Front-loaders use less water than top-loaders, so they need less detergent. If your machine requires HE (high-efficiency) detergent, use it — and use less than you think you need. The measuring lines on the detergent cap are generous by design.
Don't leave wet clothes sitting in the machine. Remove clothes promptly when the cycle ends. Wet laundry sitting in a sealed drum for hours accelerates the musty environment.
Run a monthly maintenance cycle. Once a month, run an empty hot cycle with vinegar or a commercial washing machine cleaner. This prevents buildup before it becomes a problem.
When the Gasket Needs Replacement
If you've cleaned the gasket thoroughly and the smell persists, the mold may have penetrated the rubber itself. Mold can grow inside the porous rubber material, not just on its surface. When this happens, no amount of surface cleaning will eliminate the smell.
Replacement gaskets cost $50 to $150 depending on the machine brand, and the replacement is a moderate DIY job — the gasket is held in place by spring clamps that can be released and reinstalled with basic tools. Many YouTube videos walk through the process for specific washer models.
If you're not comfortable doing it yourself, an appliance repair tech typically charges $150 to $250 for the parts and labor.
A Note About Smell vs. Cleanliness
Here's something reassuring: even when your front-load washer makes clothes smell musty, the clothes are being washed effectively. The detergent and water are still cleaning your clothes of dirt and most bacteria. The smell is being transferred from the mold in the machine to the clean, damp clothes — it's a contamination-after-cleaning problem, not a failure to clean.
That said, you don't want mold transferring to your clothes, and you don't want to smell like a wet towel. The fixes above are straightforward, and once you adopt the habit of leaving the door open, this problem largely solves itself going forward.
If you're tackling other laundry-related problems, you might also want to look at white laundry coming out with grey spots or getting diesel fuel smell out of clothes — different problems, but all part of keeping your laundry routine running smoothly.
Related: Why Does My Washing Machine Smell Like Sewage? · White Laundry Comes Out With Grey Spots · Dryer Takes Two Cycles to Dry Clothes
Written by Sarah Mitchell
Sarah writes about home improvement and practical DIY topics. She focuses on clear, step-by-step guides that anyone can follow.