MaryKate Mildew Stain Remover is fast and effective - no scrubbing necessary. Just spray on and wipe off! The fine mist spray won't run, even on vertical surfaces. Ideal for use on boat covers, bimini tops, and seat covers, Mildew Stain Remover also works great on Sunbrella, acrylic, synthetic, polyester, and vinyl marine-grade fabrics. 32 fl. oz. MPN#: MK3732.