I have a large number of white vinyl windows where the frames have become discolored, with brown and black discolorations. Windows are 10 years old and on the morning sun side of the home in a warm area (Reno)
I have tried to contact Certainteed, who I believe has bought the manufacturer, Insulate Industries, but so far no luck.
Has anyone else had this experience with a vinyl window, or does anyone know a fix??
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