I have had tremendous luck with using RainX on the outside AND inside of the glass.
Clean your glass very well prior.The outside needs a repeat after a couple of months.
My rubber seals don't drag and squeak and my 15 year old window motors are stressed less.
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2000 Boxster S. Factory hardtop. 6 speed. Arctic Silver. Boxster Red leather. IMS/RMS.
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