Mr. Clean magic eraser for scuffs?

[tlc356]

The Boxster clear coat when scratched leaves a visible mark. One simple way to get them out is a 3M scratch remover (others make similar products with similar names).
If the scratch is deep enough to detect with a finger nail you may need a more determined approach such as that wet sandpaper.

[Porsche9]

Go to the local auto parts store and they will have clay bars in stock. No need to spend a a lot of money on it. $25 tops for the clay bar and lubricant. Good luck.

[CoBeerToad]

The amazing-ness of the clay bar still fascinates me. I do this every time I clay bar, but the effect was incredibly noticeable the first time I did it. I clay barred one side of the hood, then gently dragged a microfiber towel over both sides. The resistance on the side I didn't do was so amazing to me.

I know you're not supposed to drag a towel (or anything) across your finish without some fluid, but I can't help it.