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			Conventional wisdom says that if the scratch is deep enough to catch the edge of a fingernail, then it's too deep to remove.
 I know the 987 has water repellent coating on the side-windows which would not respond well to any sort of buffing, and though I don't think this is applied to the windshield, it may have some other sort of coating applied during manufacturing.
 
 If you're going to try a toothpaste, make sure it's a paste not a gel, although this technique is more applicable to small light scratches, such as those on the face of a wrist-watch.  I don't think it would work with auto-glass, on a scratch big enough to notice, but at least your windshield will smell and taste fresh !
 
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06 987S- Sold 
Carrara White / Black / Black/Stone Grey Two-tone 
05 987 5-speed - Sold 
Midnight Blue Metallic / Metropol Blue / Sand Beige
06 MB SLK350- Lease escapee 
Iridium Silver Metallic / Black
We've heard that a million monkeys at a million keyboards could produce the complete works of Shakespeare; now, thanks to the Internet, we know that is not true.  - Robert Wilensky
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