To remove mildew stains from your white outdoor furniture, you can use several effective household methods. First, create a cleaning solution. A simple and safe option is a mixture of equal parts white vinegar and water. For tougher stains, you can use a solution of 1 cup of bleach, 1/4 cup of mild dish soap, and 1 gallon of warm water. Always test any solution on a small, hidden area first to ensure it doesn't damage the material.
Start by brushing off any loose dirt or debris from the furniture. Apply your chosen cleaning solution generously to the mildewed areas. For the vinegar solution, let it sit for at least an hour. For the bleach solution, let it sit for about 10-15 minutes. Avoid letting bleach solutions dry on the surface.
After letting the solution sit, scrub the area vigorously with a stiff-bristled brush (non-metallic for delicate surfaces) or a sponge. Focus on the stained areas to lift the mildew spores and dirt.
Once scrubbed, rinse the furniture thoroughly with a garden hose or a bucket of clean water. It is crucial to remove all cleaning residue. For a final, powerful rinse, using a pressure washer on a low setting can be very effective, but keep the nozzle at a safe distance to avoid damaging the furniture.
After cleaning, allow the furniture to dry completely in the sun, which has natural bleaching properties. To prevent future mildew growth, try to keep furniture dry, use covers when not in use, and clean it periodically. For persistent stains, commercial outdoor cleaner products designed for mildew are also available.