If the area isn't too large (and in this case it doesn't appear to be) and the damage not too deep (doesn't appear to be that either) it's really not too difficult to polish minor blemishes and scratches out by hand. Safer too, especially in a tight area like that.
Coincidentally, just today I was repairing some deepish scratches using that BMW touch-up paint that everybody loves so much (minor sarcasm there). That involved prepping with 1000 grit wet paper, leveling with 1000 and then 2000 grit, which makes a scary looking smudge, and then finishing off with a couple of grades of liquid compound. All by hand, and the result is a beautiful scratch-free mirror finish. A bit time consuming, but the results are worth it.
Go slowly, go lightly, and, as others have said, try the finest abrasive you have before bringing out the heavy artillery.