You must do "The Boxster chop" when putting your roof down, this is as follows:
Half way through the roof cycle (folding away) stop,get out of your car and push a crease into the centre of the plastic rear window so that when you continue with the folding away cycle the rear window has a nice fold in the middle
(when new these early cars came with a piece of soft cloth that was supposed to be put between this fold to stop the plastic to plastic rubbing)
Oh and keep the plastic clean!
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