In short: keep indoor humidity below 60%, ideally 30% to 50%, run the AC and bathroom fan, and scrub small patches of mildew off hard surfaces with detergent and water, then dry them completely. Report leaks and large patches to your landlord in writing.
Why Florida homes get mildew
Warm, humid air holds a lot of moisture. When it meets a cool surface or sits in a closed room, mildew grows, most often in bathrooms, closets, behind furniture against outside walls, around window frames and in the AC closet.
Prevent it
- Run the AC through the summer, even when you are out. Set it a few degrees warmer rather than turning it off
- Run the bathroom fan during showers and for 20 minutes after, or open a window
- Leave closet doors open a little and do not pack them tight against outside walls
- Wipe shower walls and glass after use, and hang towels to dry
- Dry anything wet within 24 to 48 hours. Most mold will not grow if materials are dried in that time
- A dehumidifier or humidity meter helps in rooms that stay damp
Clean small patches
- Open a window or run the fan
- Scrub hard surfaces such as tile, grout and sinks with detergent and water
- Dry the area completely
- Replace stained caulk if mildew has grown into it
Never mix bleach with ammonia or cleaners that contain it. The mixture gives off toxic fumes.
The EPA says an area of about 10 square feet or less, roughly 3 feet by 3 feet, is usually a job you can clean yourself. Larger areas or mold after water damage need a professional.
Tenants and landlords
Mildew from day to day living, such as a bathroom not cleaned or ventilated, is usually the tenant's to clean. Mold from a leak, a roof or plumbing problem or a faulty AC drain is a repair for the landlord, who must keep the building and plumbing in good repair under Florida law. Report leaks in writing as soon as you see them, and keep a copy.
A deep clean after the summer clears mildew from grout, caulk, closets and vents. Send a request and a local cleaner will call you to quote.
This guide is general information, not legal advice. Laws change, and your lease may add terms. For advice on your situation, speak to a Florida attorney or the Legal Aid Society of Palm Beach County.