In a Miami home, controlling mildew is mostly about controlling moisture. The EPA recommends keeping indoor humidity below 60 percent (ideally 30 to 50 percent) and drying anything that gets wet within 24 to 48 hours. You can clean small patches of mildew on hard surfaces yourself with detergent and water. Larger areas need a mold professional, not just a cleaner.
No cleaning routine can promise a home that stays mold-free in a subtropical climate. A good routine keeps surfaces dry, stops the musty smell coming back, and helps you spot trouble early. Here is how that works in South Florida homes.
Bathrooms are usually the first room where this shows up. We cover that separately in why mildew keeps returning in Miami bathrooms.
Why Miami homes fight moisture all year
Mold needs moisture to grow. The EPA sums up its own guidance in one line: “The key to mold control is moisture control” (EPA, A Brief Guide to Mold, Moisture and Your Home). In South Florida the moisture comes from a few predictable places:
- Outdoor air. Humid air comes in every time a sliding door opens and whenever the AC isn’t keeping up.
- Daily storms in the wet season (roughly late May through October). Wet shoes, umbrellas and towels come inside.
- Hurricane season (June 1 to November 30). Wind-driven rain gets in around windows and doors.
- AC systems themselves. Clogged drain lines and dirty return grilles are common sources of damp spots and musty air.
- Closed-up homes. Seasonal residents who leave for the summer and shut the AC off come back to a house that has been sitting in humid air for months.
The routine: dry, clean, ventilate
After every shower
- Squeegee the glass and tile walls, or towel them dry.
- Run the exhaust fan for a while after the shower, and leave the door and curtain open.
- Hang bath mats and towels flat so they dry fully, not folded over a hook.
Weekly
- Scrub shower grout, caulk lines, and the bottom edge of shower curtains or doors with detergent and water, then dry them. The EPA’s hard-surface method is exactly that: “Scrub mold off hard surfaces with detergent and water, and dry completely.”
- Wipe window sills and sliding-door tracks, where condensation and rain collect.
- Check under the kitchen and bathroom sinks for drips.
- Wash bath mats, dish towels and pet bedding.
Monthly
- Vacuum and wipe the AC return grilles and supply vents. Check the filter and change it on the schedule your system’s manufacturer recommends.
- Open closets on exterior walls and look at the back wall, shoes and leather goods. These are common spots for a musty smell to start.
- Clean the refrigerator drip pan and door gaskets, and the washing machine gasket and detergent drawer.
What to use, and what not to mix
For routine cleaning of small mildew spots on hard, non-porous surfaces (tile, glass, sealed counters), detergent and water followed by thorough drying is the EPA’s starting point. A few cautions:
- Never mix bleach with ammonia or with products that contain ammonia. The EPA warns that the combination produces toxic fumes. As a rule, don’t mix any cleaners unless the label says to.
- Ventilate with a window open or a fan running while you clean.
- Protect natural stone. Acidic cleaners (vinegar, lemon) can etch marble and terrazzo. Use a pH-neutral stone cleaner on those surfaces.
- Masking isn’t fixing. Air fresheners and bowls of baking soda can cover a musty smell. They don’t remove the damp source behind it.
This guide is about reducing moisture and your household’s exposure to mildew on surfaces. It isn’t medical advice, and it doesn’t prevent or treat any health condition. If anyone in your home has asthma or allergies that seem worse indoors, talk to a doctor.
When cleaning isn’t enough
The EPA draws a practical line. If the moldy area is smaller than about 10 square feet (roughly a 3 ft by 3 ft patch), most homeowners can handle it themselves. Larger areas, mold that keeps coming back, mold inside walls or AC ducts, and any water damage from flooding or a leak are jobs for a mold assessment or remediation professional, and possibly a plumber, roofer or AC technician to fix the source. Porous materials such as ceiling tiles and carpet may need to be thrown out rather than cleaned.
To be clear about our own scope: Miami House Cleaning is a cleaning company, not a mold remediation company. We clean and dry surfaces as part of regular and deep cleans. We don’t test for mold, treat it inside walls or remove damaged materials.
A South Florida calendar for moisture control
- May: before the wet season starts, test bathroom exhaust fans, have the AC drain line checked, and clean out damp storage areas.
- June to November: after any storm that brings water inside, dry the area within 24 to 48 hours. Our late-summer humidity guide goes county by county.
- Before leaving for the season: leave the AC or a dehumidifier running rather than shutting the house down completely, empty and prop open the fridge if it will be off, and ask someone to check the home periodically.
- On your return: air the house out, run the AC, and do a top-to-bottom clean before you settle in.
Where a professional clean fits
A deep clean is the useful reset: grout, tracks, vents, baseboards and the corners a weekly wipe misses. Deep-clean pricing scales with square footage. After that, a recurring clean keeps bathrooms and kitchens from sliding back. Recurring schedules are discounted 6% weekly, 5% biweekly, 4% every three weeks and 3% monthly. Regular cleans start at $156 flat rate for a studio under 1,000 sq ft. You can see how pricing works on our Miami house cleaning cost page.
“I recently hired Miami House Cleaning for a deep cleaning and I’m extremely impressed. They arrived on time, used eco-friendly products, and cleaned every corner of my home to perfection. My space was spotless, fresh, and inviting. Highly recommend!”
— Robert, Miami (verified Google review)
Quick answers
Does vinegar kill mold?
The EPA’s guidance for small areas on hard surfaces is detergent and water, then drying completely. Don’t use vinegar on marble or terrazzo, which it can etch.
Should I use bleach on mildew?
The EPA doesn’t recommend routine use of biocides such as bleach for mold cleanup. If you do use bleach, follow the label, ventilate, and never mix it with ammonia.
Why does my closet smell musty even though I don’t see mold?
Closets on exterior walls often run cooler and more humid than the rest of the house. Improve airflow, keep the AC running, and check the back wall and any stored fabric or leather.
If you want the grout, tracks and vents reset before the next storm season, request a free estimate or call 754-354-6072. New customers who call get 10% off their first clean (phone bookings only). We accept Visa, Mastercard, American Express, debit and crypto.
Full details, what is included and flat-rate pricing are on our house cleaning in Miami page.
Written by the Miami House Cleaning team with AI assistance; facts checked against our published services and pricing.