Outdoor sofa cushions are prone to developing unpleasant musty odors due to moisture, mildew, and lack of proper care. Here are practical solutions to keep them fresh and odor-free:

1. Regular Cleaning: Wash cushions monthly with mild soap and water. For stubborn odors, use a vinegar-water solution (1:1 ratio) or baking soda paste. Always let them dry completely in sunlight.

2. Proper Storage: When not in use, store cushions in a dry, ventilated area. Use breathable storage bags instead of plastic to prevent trapped moisture.

3. Use Weatherproof Covers: Invest in waterproof covers to shield cushions from rain and dew. Remove covers periodically to allow airflow.

4. Sunlight Exposure: UV rays naturally kill mold and bacteria. Rotate cushions weekly to ensure even sun exposure.

5. Moisture Absorbers: Place silica gel packs or cedar blocks underneath cushions to absorb excess humidity.

6. Fabric Choice: Opt for quick-drying, mold-resistant fabrics like Sunbrella when replacing cushions.

For severe mildew, use a diluted bleach solution (1 cup bleach per gallon of water), but test on a small area first. Prevention is key—consistent care will extend your cushions' lifespan and keep them smelling fresh all season.