Humidity, Mold and Mildew: A Cleaning Guide for Savannah Homes

In Savannah and the rest of coastal Georgia, mold and mildew are a moisture problem first and a cleaning problem second. Keep indoor humidity below 60 percent, dry anything wet within a day or two, and clean the damp-prone spots on a regular schedule, and most homes never get past the occasional speck of mildew on a grout line.

This guide explains why the coast is so hard on homes, sets out the EPA's moisture targets, and gives routines for bathrooms, closets and HVAC systems, plus a clear line between a cleaning job and a remediation job.

Why coastal Georgia homes get mildew

Savannah's air is damp most of the day, most of the year. NOAA records summarized for 1961 to 1990 put the city's average relative humidity at about 86 percent at 7 a.m. and 54 percent in the afternoon. Atlanta, by comparison, averages about 82 percent in the morning and 52 percent in the afternoon. The coast also sits squarely in the path of Atlantic storms during hurricane season, which runs from June 1 to November 30.

That moisture finds the coolest, least ventilated surfaces: bathroom ceilings, the backs of closets, window frames, the underside of sinks and the inside of air conditioning equipment. Mildew is simply mold growing on a surface, and both need the same three things: moisture, a food source such as dust, soap scum or fabric, and time.

The numbers that matter

The Environmental Protection Agency's homeowner guide, A Brief Guide to Mold, Moisture and Your Home, boils prevention down to a few figures.

Target	EPA guidance	What it means at home
Indoor humidity	Below 60%, ideally 30% to 50%	Buy a hygrometer, which the EPA says costs about $10 to $50, and check it in several rooms
Drying time	Dry water-damaged areas and items within 24 to 48 hours	Treat a leak or spill as urgent, even in winter
DIY limit	Mold covering less than about 10 square feet	Roughly a 3-by-3-foot patch; anything larger calls for more help
Porous materials	Moldy ceiling tiles and carpet may have to be thrown away	Cleaning the surface will not reach mold inside

The EPA's central point is that you cannot clean your way out of a moisture problem. If the water source is not fixed, the mold comes back.

The bathroom routine

Bathrooms produce the most moisture in the house, so they need the tightest routine.

• Every shower: run the bathroom exhaust fan during the shower and for a while afterward, or open a window, as the EPA advises. Squeegee the glass and tile walls and spread the curtain or open the shower door so it dries.
• Weekly: scrub grout, caulk lines, the tub rim and the base of the toilet with a bathroom cleaner or detergent and water. Wash bath mats and towels, and hang towels flat to dry instead of bunched on a hook.
• Monthly: wash or replace the shower curtain liner, clean the fan grille so it actually moves air, and check under the sink for drips.
• Twice a year: look for gaps and black staining in caulk. Remove and replace stained caulk rather than painting or caulking over it. The EPA warns against covering moldy surfaces before they are cleaned and dried.

Closets, laundry and storage

Closets are where many Savannah households first notice a musty smell, because humid air settles where nothing moves it.

• Leave closet doors open a crack, and do not pack clothes tightly against an exterior wall.
• Store only clean, fully dry clothes. Body oils and food traces feed mildew.
• Use breathable fabric bins instead of sealed plastic for seasonal clothes, and check leather shoes, bags and belts every few weeks in summer.
• Vent the clothes dryer outdoors, as the EPA recommends, and clean the lint screen after every load.
• Leave the front-loading washer door and detergent drawer open between loads, and wipe the door gasket weekly.
• Keep stored boxes off garage and storage room floors, where water collects after heavy rain.

HVAC, dehumidifiers and air ducts

Your air conditioner is your main dehumidifier in summer, which only works if it is clean and draining properly.

• Filters: change them on the schedule your system's manufacturer recommends, and more often during heavy pollen or construction dust.
• Condensate drain: make sure the line runs clear and the drip pan does not hold standing water. A clogged line is a common source of hidden leaks.
• Vents and returns: vacuum the grilles and wipe them with a damp cloth. Dark speckling on a ceiling vent usually means condensation, and it is worth a technician's look.
• Dehumidifiers: a portable or whole-house unit helps in bonus rooms, basements and closed-up homes. Empty and clean the bucket regularly.

The EPA is clear on one point: do not run the HVAC system if you know or suspect it is contaminated with mold, because it can spread spores through the house. That is a call for an HVAC professional.

A year-round moisture calendar

Coastal Georgia does not get a dry season long enough to forget about moisture, but the jobs shift with the weather. Use this calendar as a starting point and adjust it to your home.

Season	Focus	Cleaning and maintenance tasks
Spring (March to May)	Pollen and the first humid weeks	Change HVAC filters, wash window screens and tracks, clean bathroom fan grilles, check caulk and grout
Summer (June to August)	Peak humidity and storm season	Monitor indoor humidity weekly, empty and clean dehumidifier buckets, check the condensate line, air out closets
Fall (September to November)	Late-season storms	Clear gutters, inspect under sinks and around the water heater, wash curtains and bedding stored over summer
Winter (December to February)	Condensation on cool surfaces	Wipe window condensation daily, keep furniture a few inches off exterior walls, deep clean bathrooms and the kitchen

Write the tasks into your calendar or phone reminders. Small, regular attention costs far less than a remediation bill.

Cleaning small patches of mold safely

For a small area on a hard surface, the EPA's approach is simple:

1. Fix the moisture source first.
2. Wear an N-95 respirator, gloves that reach mid-forearm and goggles without vent holes.
3. Scrub hard surfaces with detergent and water, then dry them completely.
4. Bag and discard moldy porous items you cannot clean, such as ceiling tiles or carpet pads.
5. Do not use bleach as a routine step, and never mix bleach with ammonia-based cleaners.

Call a mold remediation professional when the mold covers more than about 10 square feet, when it is inside walls or ductwork, after flooding or sewage backups, or when someone in the home has asthma, allergies or a weakened immune system. A cleaning service can handle routine mildew and post-remediation cleanup, but it should not be your first call for a large outbreak.

Storm season and flooding

Every storm that brings water inside starts the EPA's 24-to-48-hour clock. Before the season, clear gutters and downspouts, check that the ground slopes away from the foundation, and keep fans, a wet vacuum and a dehumidifier where you can reach them. After water gets in, photograph the damage for insurance, remove soaked rugs and padding, run fans and dehumidifiers, and throw out porous items that stayed wet. Our hurricane-season cleaning checklist was written for Florida, but the steps apply just as well on the Georgia coast.

When to hand it to a pro

A deep cleaning resets a damp-prone home: grout and caulk lines, fan grilles, baseboards, window tracks, inside cabinets and the spots routine cleaning misses. Across 44 Georgia jobs that included deep cleaning between January and October 2026, the median whole-job total was $545. We completed only six jobs in the Savannah area in that period, too few for a reliable local average, so ask for a quote for your home.

Hello Cleaners books deep cleaning across Savannah and Chatham County, with the price confirmed before your visit. See our prices or request a free quote. If you find mold beyond the EPA's 10-square-foot guideline, start with a remediation specialist, then bring us in for the cleanup.