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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