hi gary we have used a pro-tec cover for the last 4 winters we give the van a good clean and polish qwhen we finish our season around mid november then when we a ready to go out in spring the van is nice and clean ready to go. no green algie bird phoo etc. we would recomend them ,p.s a salesman who sold the cheap one,s are not worth using as they are not breathable, he did,t sell the better one's we bought ours direct regards peter