[Porsche9]

Those abrasive sponges, aka, Mr. Clean sponge, can be pretty tough on soft surfaces. I've learned the hard way but fortunately not on my Porsche.

There are a number of products, some referenced here, that should get this taken care of. When I bought my Boxster the dealer gave me a bottle of Porsche branded cleaner for the vinyl window and if did a really good job of keeping the window clear and getting scratches out.

Good luck.