Mildew on outdoor sofa welting can be a frustrating problem, especially in humid climates. To keep your furniture looking fresh and mold-free, follow these effective prevention tips:

1. Regular Cleaning: Wipe down the welting with a mild soap and water solution weekly to remove dirt and moisture that can encourage mildew growth.

2. Use Vinegar or Bleach Solutions: For stubborn mildew, mix equal parts white vinegar and water or a diluted bleach solution (1:10 ratio) to spot-treat affected areas. Always test on a small section first.

3. Waterproofing Spray: Apply a fabric-safe waterproofing spray to the welting to create a moisture barrier. Reapply every few months for maximum protection.

4. Ensure Proper Airflow: Store cushions upright or in a dry place when not in use, and avoid covering damp furniture, as trapped moisture accelerates mildew.

5. Choose Mold-Resistant Materials: If replacing your sofa, opt for outdoor fabrics labeled as mildew-resistant or treated with antimicrobial coatings.

By incorporating these practices, you can extend the life of your outdoor sofa and keep its welting clean and mildew-free year-round.