Find and remove the moisture source
Open windows and improve ventilation
Run dehumidifiers
Use fans to circulate air
Wash affected fabrics with hot water and detergent
Add white vinegar to the wash when appropriate
Use baking soda on washable items
Dry items completely in sunlight if possible
Clean hard surfaces with vinegar or a mildew cleaner
Scrub grout, tile, and bathroom surfaces thoroughly
Discard items that are too moldy to clean
Clean HVAC filters and vents
Keep indoor humidity below 50%
Store dry items in airtight containers
Repeat cleaning if the smell returns