Xanigo Marine Mold and Mildew Remover Spray 16 oz. This powerful formula is easy to use and is the perfect solution for removing mold and mildew stains from boat tops, vinyl cushions, chairs, canopies, and more. Its versatile formula can also be used on rubber fenders, fiberglass, caulk, tile, grout, shower stalls, sinks, counters, and other surfaces that may be prone to mold and mildew. Let it sit for 60-90 seconds but do not let dry. Additional solution may need to be applied-- keep it wet. Agitate in a circular motion with a brush to release the mold stains from the pores. Rinse thoroughly with clean water. Follow up with Xanigo Marine's Waterless Wash to neutralize the stain remover to reduce the risk of harm to your stitching.