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pics....but like groundzero said, its probably aftermarket. If you can grab ahold of the film and peel it, its aftermarket. if it just looks like its peeling its probably being oxidized and turning yellow.
If it's turning yellow/oxidizing, try Plast-x from Meguiars. Also, 210 or Plexus would work as well (local boating store might sell the last 2 mentioned)