How can mildew odor be removed from a front-loader?

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Gather Necessary Materials

Inspect and Clear the Drum and Door Seal

Open the washer’s door and visually inspect for mold or mildew deposits, particularly around the rubber gasket (door seal) and the detergent drawer.
Remove any visible debris that may be harboring moisture by hand or with a dry cloth.
If detachable parts like the detergent drawer are present, remove them according to the manufacturer's instructions for cleaning.

Clean the Rubber Gasket Thoroughly

Create a cleaning solution by mixing equal parts white vinegar and water in a bowl.
Dip the toothbrush in the solution and gently scrub along the rubber gasket, paying attention to the folds where mildew tends to hide.
For persistent areas, sprinkle a small amount of baking soda on the affected spots before scrubbing to boost the cleaning power.
Wipe off loosened residues with a clean, damp cloth. Repeat the process if necessary.

Clean the Detergent Drawer and Other Removable Components

Soak the detergent drawer and any removable parts in a mixture of hot water and a few drops of dish soap for about 20–30 minutes.
Use a brush or cloth to scrub away any buildup of detergent or mildew.
Rinse thoroughly and dry completely before replacing them back into the machine.

Run a Cleaning Cycle with Vinegar and Baking Soda

Add 2 cups of white vinegar directly into the washer drum.
Optional: Sprinkle 1/2 cup of baking soda inside the drum to help neutralize odors and break down residue.
Select the hottest and longest wash cycle available. Running an empty cycle allows the vinegar and baking soda to work on mold spores, mildew, and lingering odors.
After the cycle, open the door immediately so that the interior can dry completely.

Wipe Down and Air Out the Machine
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After cleaning cycles, wipe the interior surfaces of the drum and door with a dry, clean cloth.
Leave the door and detergent drawer open between uses to allow airflow and reduce moisture buildup.
Consider using a dehumidifier or placing the washer in a well-ventilated area if your laundry space tends to be damp.

Establish a Regular Maintenance Routine

Clean the gasket and detergent drawer monthly using the methods described to prevent future mildew buildup.
Run a cleaning cycle (using vinegar and baking soda or a specialized washer cleaner) at least once every 4–6 weeks.
Follow manufacturer recommendations on detergent usage. Excess detergent can trigger residue build-up, promoting mold growth.

Additional Tips for Long-Term Odor Prevention

Consider using high-efficiency (HE) detergents if your washer is designed for them, as these produce less suds and residue.
If you live in a humid area, try to keep the washer's environment as dry as possible with good ventilation.
Regularly check and clean any drainage filters to ensure that standing water does not encourage mildew formation.
If the odor persists, consult the appliance manual or contact a professional service to inspect for hidden mold or mechanical issues.

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