Mildew stains on outdoor furniture cushions are a common problem, especially in humid climates. Fortunately, you can remove them effectively with a few simple steps and common household items.
First, take the cushions off the furniture. If the care tags allow, check if they are machine washable. For machine-washable cushions, use a gentle cycle with hot water and add about one cup of white vinegar or bleach to the wash to kill the mildew spores.
For hand cleaning or non-machine-washable cushions, start by brushing off any dry, loose spores outdoors. Then, create a cleaning solution. A simple and effective mixture is one part white vinegar to one part water. For tougher stains, you can make a paste from baking soda and water or use a diluted bleach solution (one cup of bleach to a gallon of water). Always test any cleaner on a small, hidden area of the cushion first to ensure it doesn't damage the fabric.
Apply your chosen cleaning solution to the mildew stains. Scrub gently with a soft-bristled brush to work the cleaner into the fabric. Let the solution sit on the stains for at least 15-20 minutes. For the vinegar or bleach solution, you can let it sit for up to an hour for severe stains.
After soaking, rinse the cushions thoroughly with a garden hose or with clean water. It is crucial to remove all the cleaning solution.
The final and most important step is to let the cushions dry completely before putting them back on the furniture. Place them in direct sunlight if possible, as the sun's UV rays have a natural bleaching effect and will help kill any remaining mildew. Ensure they are entirely dry to prevent mildew from returning.
To prevent future mildew, store cushions in a dry place when not in use or during wet weather. Regular cleaning and ensuring cushions are completely dry after rain can also help keep mildew at bay.