Sap stains on outdoor furniture fabric can be frustrating, but with the right techniques, they can be removed effectively. Here are some proven methods:

1. Freeze and Scrape: Harden the sap by placing ice cubes on it for a few minutes. Once brittle, gently scrape it off with a dull knife or credit card.

2. Rubbing Alcohol: Dampen a cloth with rubbing alcohol and blot the stain. Avoid rubbing, as this can spread the sap. Repeat until the stain lifts.

3. Dish Soap and Warm Water: Mix mild dish soap with warm water and apply it to the stain. Use a soft brush to work the solution into the fabric, then rinse thoroughly.

4. Vinegar Solution: Combine equal parts white vinegar and water. Apply to the stain, let it sit for 10 minutes, then blot with a clean cloth.

5. Commercial Fabric Cleaner: For tough stains, use a specialized outdoor fabric cleaner. Follow the product instructions for best results.

Always test any cleaning solution on an inconspicuous area first to avoid damage. Regular maintenance and prompt treatment of stains will keep your outdoor furniture looking fresh.