How to Remove Mold and Mildew from Outdoor Furniture

How to Remove Mold and Mildew from Outdoor Furniture

That dark, fuzzy growth on your patio furniture isn't just unsightly—it can damage materials and even pose health risks if left untreated . Fortunately, with the right approach, you can remove mold and mildew and restore your outdoor pieces to their former glory.

Understanding Mold vs. Mildew

Before you start cleaning, it helps to know what you're dealing with. Mold is typically dark green, black, or blue and appears thicker and fuzzier. It can grow on virtually any surface and is often stubborn to remove. Mildew is usually lighter in color—white or gray—and tends to grow in flat patches on fabric and hard surfaces. It's generally easier to clean .

General Safety Tips

Before applying any cleaning solution :

  • Work outside or in a well-ventilated area to avoid inhaling spores

  • Wear gloves and a mask, especially if dealing with large patches of mold

  • Test any cleaning solution on a small, inconspicuous area first to ensure it doesn't damage the material

  • Let materials dry fully in direct sunlight after cleaning to kill remaining spores

Cleaning Different Materials

Outdoor Cushions and Fabrics

Cushions, umbrella canopies, and fabric seat covers are prime targets for mold. Leaving cushions out in the rain or storing them while damp allows moisture to get trapped in the fibers and seams .

For general outdoor fabric:

  1. Brush off loose mold using a soft-bristle brush. Do this outdoors to avoid spreading spores .

  2. Mix your cleaning solution: 1 part white vinegar + 1 part water for natural cleaning . For tougher stains on white or colorfast fabrics, mix 1 teaspoon dish soap + 1 cup bleach + 1 gallon warm water .

  3. Apply generously using a sponge or spray bottle and let it sit for 10–15 minutes .

  4. Scrub gently in circular motions with a soft brush .

  5. Rinse thoroughly with a hose .

  6. Allow to air-dry in direct sunlight—UV rays help kill remaining mold spores .

For removable cushion covers: If your cushions have zippered covers, remove them and wash separately. You can toss them in the washing machine with a bit of vinegar to kill mold .

For foam-filled pillows: Spot clean moldy areas with diluted vinegar solution and use gentle pressure when scrubbing to protect the foam structure. Avoid fully soaking foam, as it's difficult to dry completely. If a pillow still smells musty after drying, it's best to replace it .

For Sunbrella or similar solution-dyed acrylic fabrics: These are mold-resistant but still benefit from cleaning. Use a mixture of ¼ cup bleach, ¼ cup mild soap, and 1 gallon water for stubborn mold stains. Let it soak for 15 minutes before rinsing .

Wood Furniture

Wood is porous, meaning mold can seep beneath the surface. Treating mold early is key to preserving the wood .

  1. Scrub with a dry brush to remove surface mold .

  2. Mix a gentle cleaning solution—1 part white vinegar + 3 parts warm water works well .

  3. Apply with a sponge or soft cloth, working into the grain .

  4. Rinse with a hose or wipe down with a damp cloth .

  5. Allow to dry completely in the sun .

  6. For stubborn stains, lightly sand the affected area and re-seal it with outdoor wood oil or sealant .

Important: Avoid bleach on natural wood—it can discolor the surface or weaken the finish .

Wicker and Rattan

Wicker, especially natural rattan, is prone to mildew due to its many crevices .

  1. Use a vacuum with a brush attachment to remove loose debris and mold spores .

  2. Mix a cleaning solution of ¼ cup white vinegar + 2 cups water .

  3. Gently scrub the surface using a soft brush or cloth .

  4. Use a toothbrush to get into tight weaves or corners .

  5. Wipe with a damp cloth and let dry thoroughly in sunlight .

Note: Sugar soap is not suitable for natural wicker or cane, which may weaken when exposed to moisture .

Plastic and Resin Furniture

Plastic is non-porous, making it easy to clean .

  1. Wipe down to remove surface dirt .

  2. Use a cleaning solution of 1 cup white vinegar + 1 quart warm water .

  3. Scrub with a sponge or non-abrasive brush .

  4. Rinse with a hose .

  5. Dry with a soft towel or leave in the sun .

For tough spots: Use a baking soda paste (3 parts baking soda + 1 part water) .

Important: Avoid using bleach on plastic furniture, as it can damage the material .

Metal Furniture

Metal is less prone to deep mold growth, but mildew can still form on surfaces, especially in joints .

  1. Mix mild dish soap with warm water and wipe down surfaces .

  2. Rinse thoroughly and dry immediately to prevent rust .

  3. If rust appears, use a rust remover and apply a protective sealant .

Natural Cleaning Solutions

If you prefer to skip harsh chemicals, these eco-friendly options work well :

  • White vinegar: Antifungal and safe for most fabrics

  • Baking soda: Deodorizes and breaks down stains

  • Hydrogen peroxide: Mild bleach alternative for colored fabrics (test first)

  • Lemon juice + salt: Brightens and disinfects, especially in sunlight

  • Tea tree oil: Mix 2 teaspoons with 2 cups of water for a natural antifungal spray 

Preventing Future Mold Growth

After cleaning, keep mold from returning with these proactive measures :

  • Store furniture and cushions in dry, ventilated areas when not in use 

  • Elevate items off wet ground or decks during rain to avoid moisture pooling 

  • Use covers with ventilation flaps, not plastic tarps that trap humidity 

  • Let everything dry completely before covering or stacking 

  • Clean furniture seasonally, even if mold is not visible 

  • Apply a fabric protectant with mildew resistance to cushions after cleaning 

  • Spray outdoor fabrics with a UV- and water-repellent spray to extend lifespan 

When to Replace Instead of Clean

Sometimes, no amount of scrubbing can fix mold-damaged items. Replace cushions or pillows if :

  • They still smell musty after thorough cleaning

  • Fabric is stained beyond repair

  • Mold returns quickly after cleaning

  • Fill feels lumpy or deteriorated

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