Go to Sunbrella website ....
http://www.sunbrella.com/na/en/marine.pl then on the LEFT column go to the FAQ at the bottom.Best way to remove mold and mildew that Ive found is to use Ivory SOAP and water, put it on and cover it with SARAN wrap and let it SOAK (days). Real SOAP will begin to dissolve the mold/mildew cells ..... then gently scrub with a soft brush. You may need to retreat with "303 Fabric Guard" (follow link on Sunbrella website) to restore the water repellency. ;-)