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I bought an 08 Cayman almost a month ago and then these iridescent "rainbow" discolored spots began appearing all over the car and it continues to worsen. They are not noticeable in direct sunlight or when it is dark outside, but quite noticeable during twilight hours. It kind of resembles a thin "oil slick light refraction" appearance or residual soap though I only use Meguairs products to wash and then rinse thoroughly... only in the shade with the car cool. I have been to several body shops and they shrug their shoulders offering all different kinds of theories. The place I got it from says Porsche paint can do this but I am not believing that. A couple people said it would not get worse but it definitely continues to get worse over a relatively short period of time. Any one have any clues what would be causing this and how to fix it? I would really appreciate any help or explanations.