One trick we do at our shop is to fill the "crator" or scratch with a few coats of touch up paint. After a day or so, take a razor and scratch off the paint till its more level. Hold the razor so your motion is like when you cut a line of cocaine type of thing. NOT THAT Ive ever done that but you see it in the movies

OK, now take 3000 grit wet sandpaper and scuff up the scratches you made with the razor. Not to hard and only enough to again flatten it out more.

Next (hopefully you have a powered buffer) use rubbing compound and buff the marks from the wet sanding down flatter. Now rebuff it with polishing compound and that will remove the swirls from the rubbing compound.

or take it to a shop, its a rather easy fix that shoulldnt cost more than 200 bucks tops