To effectively clean mildew or mold off urban outdoor furniture cushions, a methodical approach using common household items works best. First, take the cushions outside to a well-ventilated area to prevent spreading spores indoors. Brush off any loose dry spores with a stiff brush.
Create a cleaning solution. A highly effective and safe option is a mixture of one cup of distilled white vinegar, one cup of warm water, and a few drops of mild dish soap in a spray bottle. For tougher mold, a solution of one part chlorine bleach to four parts water can be used, but test for colorfastness on a hidden area first, as bleach can damage some fabrics.
Spray the solution generously onto the affected areas until thoroughly damp. Let it sit for 10-15 minutes to penetrate and kill the mold spores. For textured fabrics, use a soft-bristled brush (like an old toothbrush) to gently scrub the surface, paying extra attention to seams and crevices where mold thrives.
Rinse the cushions thoroughly with a garden hose or a damp cloth using clean water to remove all cleaning residue. This step is crucial, as leftover soap or vinegar can attract more dirt.
The most critical step is ensuring the cushions dry completely. Wipe off excess water with a clean, dry towel. Then, prop the cushions vertically against a wall or lay them flat in direct sunlight and good airflow. Sunlight is a natural disinfectant and helps kill remaining spores. Never store cushions until they are 100% dry inside and out to prevent mildew from returning.
For prevention, store cushions in a dry, covered area when not in use for extended periods, and consider using waterproof storage bags. Regular cleaning with a mild soap solution before mold appears is the best defense for maintaining your urban outdoor living space.