SUNBRELLA cover discoloration of the vinyl

[ers906]

I have a nice custom fit sunbrella cover for my 210 SAN, however, I am starting to get dismayed my it. My problem is that it seems to stain the vinyl which it comes in contact with. I understand that it is over 100 degrees in Phoenix during this time of year, but stained vinyl still sucks. I can wash it well with Boat Bling Vinyl Cleaner which gets some of the stain out, however, it will bleach out in the sun after a day or two. Has anyone heard this happening before? It I have coversports make a cover for me would the same thing happen? Any suggestions?
Eric

[GCSuper]

If you search other boating sites, this seems to be a common occurence, especially with black covers in the southern climates. Grey covers seem to be better. I have white interior ( 210 w/factory cover ) with a black cover in Texas, but I never leave it out in the weather. It stays under cover, which is the best alternative if possible.