Well heres what I've tried so far:
Magic erase alone - had no effect
PH Decreaser - no effect
Proteam Vinyl Cleaner - no effect.

I gonna try the vitamin C and paste mixture tomorrow. Its been warm her in ohio, we hit 92 yesterday. 88 today and high 80's tomorrow. The pool water is only 62 though. I just put the solar cover on today.
Thanks
John