Algae stains on Sunbrella covers.- How to get rid of safely
Kept in a marina and looks ugly 🤷♂️
Only 4-5 yrs old and still waterproof. Tried to clean wild mild detergent and was then going to spray with 303 Fabric protector but they did not come out.
Is there anything that can be used that will not ruin the material and stitching?