Washer-dryer combo has a strong musty or moldy odor inside the drum.

Safety first: Use only cleaning products approved for washing machines. Ensure good ventilation.

Step-by-step checks:

• Clean door boot: Wipe the rubber gasket thoroughly with a mild bleach solution or washer cleaner, paying attention to folds where water collects.
• Run cleaning cycle: Run a tub clean cycle or a hot wash with a washer cleaner tablet (or manufacturer-approved cleaner) with no laundry.
• Clean pump filter: Remove and clean the drain pump filter to eliminate trapped debris and stagnant water.
• Vent after use: Leave the door and dispenser drawer slightly open between uses to allow drying.

When to replace: If the door boot is heavily stained or moldy and cannot be cleaned, replace the door boot seal.