coolal

Hey guys, i've got a 92' 400SE, i was concerned about tinting the rear window. I told my dad i wanted to get them tinted, and he said he would, however he's worried about what the defroster will do to it. I need some information to put his mind at ease. I would assume that after so many years of tinting that all these problems would have been worked out. I'm in Los Angeles, if anyone could recomend a great tinter, and perhaps give me a rough quote it would be greatly appreciated. Additionally, anyone have any suggestions on how to remove REALLY bad water spots? I mean they won't come off in any general means. Thanks for any help you can provide.
-Alex