Why Mildew Forms on Outdoor Fabric Chairs

Mildew develops when moisture, heat, and organic particles settle on fabric surfaces. Black Outdoor Chairs tend to show white mildew more prominently because of the color contrast. Fabrics used in outdoor seating—especially those exposed to shade, humidity, or accumulated dirt—can retain enough moisture to support mildew growth.
Manufacturers like Sunstone Outdoor design outdoor fabrics for weather resistance, but routine cleaning is still necessary to prevent mildew buildup and protect long-term durability.

Begin by Brushing Off Surface Mildew

Removing loose mildew first prevents spreading during cleaning.

Steps

• Use a soft or medium-bristle brush

• Brush in one direction to avoid embedding spores

• Avoid brushing aggressively to prevent fabric wear

This prepares the surface for deeper cleaning.

Rinse the Fabric Thoroughly With Water

Rinsing helps remove remaining spores and dirt that feed mildew.

How to rinse

• Use a hose with moderate pressure

• Rinse both top and underside of the fabric

• Allow water to flow through seams and stitching

Outdoor fabrics used by Sunstone Outdoor handle rinsing well and do not weaken when exposed to regular washing.

Clean With a Mild Soap and Water Solution

Mild soap removes dirt and oils that help mildew grow.

Soap mixture

• Warm water

• Mild detergent

How to use

• Apply using a soft sponge

• Clean in circular motions

• Rinse thoroughly

This step lifts dirt and prevents future mildew regrowth.

Treat White Mildew With a Vinegar Solution

Vinegar is effective for eliminating mildew spores without damaging outdoor-grade fabric.

Vinegar mixture

• One part white vinegar

• Three parts water

Application

• Spray or wipe onto the mildew area

• Let the solution sit for 10–15 minutes

• Scrub gently with a brush

• Rinse completely to remove odor

This method works well on black fabric because vinegar does not bleach or fade colors.

Use a Diluted Bleach Solution for Stubborn Mildew

When mildew is extensive, diluted bleach can be used carefully. Outdoor fabrics designed for durability usually tolerate controlled bleach cleaning.

Bleach mixture

• One part bleach

• Ten parts water

Instructions

• Test on a hidden section first

• Apply lightly with a sponge

• Scrub gently

• Rinse immediately and thoroughly

Avoid strong concentrations to prevent fabric weakening.

Address Mildew That Has Penetrated Deep Into Fabric

If Cushions or padded fabrics are affected:

Steps

• Remove fabric covers, if possible

• Wash separately according to care instructions

• Allow filling to dry completely before reassembly

Deep moisture can cause mildew beneath the fabric surface, so drying thoroughly is essential.

Dry the Fabric Completely in Sunlight

Sunlight naturally inhibits mildew growth.

Drying tips

• Place chairs in direct sunlight

• Ensure all fabric surfaces are fully dry

• Avoid storing chairs while damp

Outdoor fabric used by Sunstone Outdoor dries quickly, helping prevent moisture retention.

Prevent Future Mildew With Regular Maintenance

Clean monthly during humid seasons

Routine cleaning prevents mildew from gaining a foothold.

Improve ventilation

Avoid placing chairs where air circulation is poor.

Keep fabric dry

Shake off rainwater and avoid leaving cushions in prolonged moisture.

Apply fabric protectant

Outdoor-safe protectants reduce moisture absorption.

These preventive steps keep black fabrics looking crisp and clean over time.

Why Sunstone Outdoor Fabric Chairs Resist Mildew Better

Breathable Outdoor Fabrics

Designed to dry quickly and reduce moisture retention.

UV-Resistant Surfaces

Sun exposure helps naturally inhibit mildew growth.

Durable Construction

Fabric maintains strength even with repeated washing.

Easy-to-Clean Materials

Allow thorough rinsing and scrubbing without weakening.

Conclusion

Removing white mildew from black outdoor fabric chairs requires brushing off loose spores, rinsing thoroughly, washing with mild soap, treating with vinegar or diluted bleach when necessary, and drying completely.
With routine cleaning and proper moisture control, mildew can be prevented from reappearing. Outdoor chairs built with weather-resistant materials—like those from Sunstone Outdoor—provide strong long-term performance and respond well to mildew removal methods.