Why Does My Washing Machine Smell Like Mildew?

If your washing machine smells like mildew, you’re not alone. That unpleasant, musty odor is a common problem caused by moisture, detergent buildup, and bacteria. The good news? You can eliminate the smell and prevent it from coming back with a few simple steps.

In this guide, we’ll walk you through why your washing machine develops mildew odors and how to fix it with a step-by-step cleaning routine.

Why Does Your Washing Machine Smell Like Mildew?

• Moisture buildup: If your washer stays damp after cycles, mold and mildew can grow.
• Soap and fabric softener residue: Excess detergent and fabric softeners create a film that traps bacteria.
• Clogged drain or filter: Blockages can prevent proper drainage, leading to stagnant water.
• Lack of airflow: Keeping the washer door closed between cycles locks in moisture, encouraging mildew growth.

How to Remove Mildew Smell from Your Washer (Step-by-Step Guide)

Step 1 – Clean the Drum with Vinegar or Baking Soda

1. Run a Hot Water Cycle: Start an empty cycle with the hottest water setting.
2. Add a Cleaning Agent: Choose one of the following:
   • 2 cups of white vinegar (natural deodorizer and disinfectant).
   • 1 cup of baking soda (absorbs odors and removes residue).
   • A commercial washing machine cleaner (check your washer’s manual for recommendations).
3. Pause Mid-Cycle (Optional): Let the solution sit for 30 minutes for a deep clean.
4. Complete the Cycle: Once finished, wipe the drum with a microfiber cloth.

Step 2 – Scrub the Rubber Gasket (Front-Load Washers Only)

1. Check for Mold: Pull back the rubber seal and look for trapped grime or mildew.
2. Clean It:
   • Mix equal parts vinegar and water in a spray bottle.
   • Spray and scrub with an old toothbrush or cloth.
   • Wipe dry with a towel to prevent moisture buildup.

Step 3 – Clean the Detergent Dispenser and Filter

1. Remove the Dispenser Tray: Take out the detergent drawer and soak it in warm, soapy water.
2. Scrub Away Residue: Use a toothbrush to remove buildup, then rinse and dry.
3. Check the Filter (if applicable): Locate the washer’s filter (often near the bottom) and remove trapped lint and debris.

Step 4 – Ensure Proper Drainage

• Inspect the drain hose for kinks or clogs.
• Run an extra rinse cycle to flush out lingering grime.

How to Prevent Your Washing Machine from Smelling Like Mildew

• Leave the door open after each wash to allow air circulation.
• Use less detergent to prevent buildup.
• Wipe the drum and gasket dry after use.
• Run a monthly cleaning cycle with vinegar or a washer cleaner.
• Use high-efficiency (HE) detergent if you have an HE washer—it produces fewer suds and reduces residue.