Cleaning Mold and Mildew in Humid Weather

Summer humidity might feel great on your skin, but it’s not so great for your home. Mold and mildew thrive in damp, warm environments—making humid weather the perfect storm for these unwelcome guests. Left untreated, they can not only damage surfaces and belongings but also trigger allergies and respiratory issues. The good news? With the right cleaning routines and a little prevention, you can keep mold and mildew at bay—even during the stickiest summer days.

If you are new to the blog, welcome! I blog about cleaning, decluttering, and organizing. You can find my free printables to help you get organized in the drop down menu under the Printables category. Check out this post on How to Get Rid of Bathroom Mold and Keep it From Coming Back.

You can find my Free Printable Home Maintenance Record here. Also, you can read my Seasonal Home Maintenance Checklists here.

Cleaning Mold and Mildew in Humid Weather

🦠 What’s the Difference Between Mold and Mildew?

Before we jump into the cleaning, let’s break down the difference:

• Mildew is typically gray or white and grows flat on moist surfaces like shower tiles and windowsills. It’s easier to clean and usually doesn’t penetrate surfaces.
• Mold can be black, green, orange, or even purple. It can grow on walls, ceilings, fabrics, and wood. It tends to spread deeper and can be tougher to eliminate.

Both love moisture, so humid weather is their happy place—unless you take action.

🧽 Where Mold and Mildew Grow During Humid Weather

Be extra vigilant in these high-risk areas during the summer:

• Bathrooms (especially around tubs, showers, and sinks)
• Laundry rooms
• Basements and crawlspaces
• Kitchens (under sinks, around dishwashers)
• Windowsills and frames
• AC vents and ducts
• Closets and stored clothing
• Patio Cushions

✅ Supplies You’ll Need to Clean Mold and Mildew

Here’s what you should have on hand:

• White vinegar (natural and effective)
• Baking soda
• Hydrogen peroxide (3%)
• Dish soap
• Spray bottle
• Scrub brush or sponge
• Old toothbrush (for corners)
• Microfiber cloths
• Protective gloves and mask (for larger areas or stubborn mold)

🧼 How to Clean Mold and Mildew by Area

🚿 Bathroom Tile & Grout

Best for: Mildew buildup

1. Spray the area with undiluted white vinegar.
2. Let it sit for 30–60 minutes.
3. Scrub with a brush or old toothbrush.
4. Rinse with warm water.
5. Repeat as needed.

Optional: Sprinkle baking soda on the grout before scrubbing for extra power.

🪟 Windowsills and Frames

Best for: Condensation-related mold or mildew

1. Mix 1 part vinegar with 1 part water in a spray bottle.
2. Spray and let sit for 15–20 minutes.
3. Wipe clean with a microfiber cloth.
4. Use an old toothbrush to get into crevices.

🧺 Washing Machine (Front-Loader Mildew Smell)

Best for: That musty smell in your laundry

1. Wipe the rubber seal with a cloth soaked in vinegar.
2. Sprinkle baking soda in the drum.
3. Run a hot wash cycle with 2 cups of vinegar.
4. Leave the door open to air out afterward.

🧦 Closets and Clothing

Best for: Musty odors or moldy spots on fabric

1. Launder washable clothes with hot water and white vinegar.
2. For stubborn mildew: Soak in a mix of water and 1 cup vinegar for 1 hour before washing.
3. For leather or non-washables: Wipe with a vinegar-dampened cloth, dry completely, and air out in the sun.
4. Don’t leave your patio cushions outside all the time. Take them inside somewhere dry or keep in a closet when not in use.

🪵 Walls and Ceilings

Important: If the mold covers a large area or keeps returning, consider calling a professional.

For small patches:

1. Mix 1 part hydrogen peroxide (3%) with 2 parts water in a spray bottle.
2. Spray the affected area and let it sit for 15 minutes.
3. Gently scrub with a sponge or brush.
4. Wipe clean with a dry cloth.

🌬️ Tips to Prevent Mold and Mildew During Humid Weather

1. Use a Dehumidifier

Ideal humidity levels in the home are between 30–50%. Dehumidifiers help keep things in check, especially in basements or closets.

2. Ventilate Your Spaces

Open windows when possible. Use exhaust fans in bathrooms, kitchens, and laundry rooms—even after you’re done showering or cooking.

3. Dry Wet Surfaces Immediately

Whether it’s a kitchen spill, wet towel, or a damp rug, mold spores can begin growing in as little as 24 to 48 hours.

4. Don’t Overwater Houseplants

Too much moisture in plant soil can promote mold and increase room humidity. Let the top layer dry out before watering again.

5. Avoid Piling Damp Clothes or Towels

Hang them to dry right away instead of leaving them in a hamper or on the floor.

6. Keep Closets and Storage Areas Dry

Use moisture absorbers like silica gel packets, activated charcoal, or baking soda in small spaces prone to humidity.

🧴 DIY Anti-Mold Spray (Natural and Effective)

Spritz this on areas prone to mildew to prevent growth:

• 1 cup white vinegar
• 1 cup distilled water
• 10 drops tea tree oil or eucalyptus oil (natural antifungal)

Shake well and spray weekly in trouble spots like shower walls, tile grout, or under sinks.

Mold and mildew may love humid weather, but they don’t stand a chance against a smart cleaning strategy. By tackling trouble spots early and staying consistent with cleaning and moisture control, you can keep your home fresh, healthy, and mold-free all summer long.

Don’t wait until you see or smell mold—stay ahead of the game with regular checks and preventative cleaning. Your nose (and your walls!) will thank you.