Faded curtains

We have had our '06 2720SL for 10 months & store it outside in upstate NY. We had it closed from October until early May. Since then it has been opened and now the curtains & tiebacks have faded to a nasty looking gray color (we have the blue interior). I will be replacing the curtains, but need to know if anyone else has had that problem & what have you done about it, if so? I thought maybe I could sew a lining to the new curtains, or was wondering if there was a way to apply the window film you can purchase to tint windows to both halves of the windows without removing them? Am anxious to hear from others.