303 Fabric Guard is the only product recommended by and for Sunbrella, as well as other fabric manufacturers to restore lost water and stain repellency to fabrics. When applied to clean and dry fabrics, 303 Fabric Guard restores lost water and stain repellency to straight-from-the-factory levels. Keep all your favorite fabrics crisp and clean for years to come. For the best results, thoroughly clean the fabric with 303 Multi-Surface Cleaner..