Get some 1000 or finer grit sand paper at the auto parts store, and very lightly wet sand the scratch. Use one of the soft spongy(sp?) sanding blocks, and a bowl of warm water with several drops of dishwashing liquid in it to wet sand with. I use Dawn dishwashing liquid, but I doubt it will matter what brand. Sand just enough to smooth out the scratch, and feather it back an inch or 2 on either side. Hit it with the polishing compound to get the haze out from sanding. You could use a dab of rubbing compound before the polishing compound if you have any. That small of an area....do it by hand. Practice on the bottom of the hood or a door jamb first to get the hang of it.