The only thing I've tried so far is rubbing it with the pool water and a dish towel. It doest feel any thinner than the rest of the liner, just looks a lot cleaner. Not really any softer either.I only have it in 3 or 4 places and all are by where my top posts are.

When I rub it, it comes off kind of like when rubbing a price tag off something - in little pieces that are blue. Im hoping its not a layer of the liner. I just dont know how it could be so high and only in those spots.

Im going to the local pool store now to get some cleaner for my scum ring and hopefully that will take care of it.
Thanks
John