<<<how do I get rid of lots of mildew spots on the inside of a sunbrella camper top that has been waterproofed with 303 protector on the outside.>>> Our canvas guy recommended wiping ours down with water and some non-chlorine bleach. I applied it with a sponge and it worked very well. Andy and Dinata Misovec aboard Atlantic 44 "Frobenius" in Solomons, MD Mobile Phone: 410-474-5282 Mailing address: 5334 Central Florida Parkway #132 Orlando, Florida 32821