i've also noticed on my car that the glass is more difficult to clean than the metal. streaks & smears no matter what I do. paper towels are the worst (and don't flame me for using paper towels, i don't have the patience for it). It got a lot better using micro-fiber cotton towels...but you know??? there are always smudges & streaks. And it does seem to me that there is some kind of film on the glass...that I did not put there.

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I love my Porsche...it couldn't be better!