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I have put up with a fogged up rear window for over a year now. I bought my 2000 Z3 used and the rear window was pretty bad. Not knowing much about maintaining that plastic window, I did not realize that it was damaged beyond repair. I have tried the mirror glaze polishing and cleaner products from BMW, they only help a little. I finally decided to have it replaced and got a quote from my local dealer and thought it was outrageous. I got another quote from another dealer and it was somewhat lower and I was wondering if anyone out there has had this done and what it should cost?