My 2000 box does the same thing.I fixed it with RainX.
I clean the outside and inside of the window very well and apply Rain X to both sides of the glass.
This usually lasts a couple of months dependent on how much the car sits outside.
The glass becomes super smooth and repels rain and does not drag the rubber
Thanks for the reminder as mine is past due!
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2000 Boxster S. Factory hardtop. 6 speed. Arctic Silver. Boxster Red leather. IMS/RMS.
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