Urban outdoor furniture cushions are particularly susceptible to mildew due to factors like pollution, limited sunlight, and high humidity in city environments. If you've discovered mildew on your cushions, here is the most effective and safe method to restore them.
For a natural and effective solution, create a cleaning mixture of equal parts white vinegar and water. Vinegar is a natural disinfectant that kills mildew spores. For heavier mildew growth, add a tablespoon of baking soda per cup of solution to create a scrubbing paste. Always test any cleaner on a small, hidden area of the cushion first to check for colorfastness.
Start by brushing off any dry, loose mildew spores outdoors. Apply your chosen cleaning solution generously to the mildew stains. Using a soft-bristled brush, scrub the area in a circular motion. For ground-in mildew, allow the solution to sit on the fabric for 10-15 minutes to penetrate and kill the spores.
Thoroughly rinse the cushion with a hose or clean cloth and cold water to remove all cleaning residue and loosened mildew. It is crucial to ensure the cushion dries completely before putting it back on your furniture. Place it in direct sunlight if possible, as UV rays are a natural mildew killer. Flip it over to ensure both sides are utterly dry to the touch; any remaining moisture will lead to rapid mildew regrowth.
To prevent future mildew growth, store cushions in a dry, well-ventilated area when not in use for extended periods. Consider using waterproof storage containers or breathable covers. Regularly cleaning your cushions and allowing them to dry completely after rain will significantly reduce the chance of mildew taking hold again.