If you can feel it with your finger nails, then it's too deep. Sanding and polishing
can help. But i suggest getting some touch up paint from the dealer and
fill in the scratches, sand it level, then polish. It is time consuming. Here's
one i did a while ago (about 12 hours or so):
Temporary scratch repair pictures by zsolo - Photobucket
It takes many applications with the touch up paint to get the build. The paint
type is lacquer with very little solids (more solvent) so it may take 4 applications
or more, over several days just to get the film build higher than the surrounding
OE paint. But once that's done, then you can begin sand it level. Wait a week
or longer after the build is achieved.
Good thing it's a solid color. And when done "right" it wont be very noticeable.
And this approach if far cheaper than repairing and refinishing properly;
which should be around $400+ per panel.