I just took care of "pinstriping" from tree branches with a compound and a polish pad. I don't have an orbital, so I had to do it by hand. Most of my scratches were not very deep, so it wasn't difficult. There's a couple (that only I notice) that are little deeper that will need more time and a mechanical buffer.
I used Griot's complete compound. They have it now at Autozone, and it has decent reviews. They say you can use it as a hand or mechanical polish, and it worked well. It was my first time using their product...no complaints about it.