Find and remove the moisture source
Fix leaks in roofs, pipes, windows, and foundations
Use dehumidifiers to keep humidity below 50%
Increase ventilation in bathrooms, kitchens, laundry rooms, and basements
Run exhaust fans during and after showers or cooking
Open windows when weather allows
Remove and replace moldy drywall, insulation, carpet, or ceiling tiles
Clean hard surfaces with detergent and water
Use a mold-killing cleaner on affected nonporous surfaces
Dry all cleaned areas completely
Wash fabrics, curtains, bedding, and clothing that smell musty
Discard items that cannot be fully cleaned
Clean HVAC vents, filters, and drip pans
Replace air filters regularly
Use an air purifier with a HEPA filter
Place baking soda or activated charcoal in smelly areas
Empty and clean trash, drains, and hidden damp spots
Check under sinks, behind appliances, and inside closets
Remove wet materials within 24 to 48 hours
Call a professional mold remediation service for widespread mold
Keep the house dry and well-ventilated to prevent the smell from returning