Scratch X 2.0
Recently bought a black car that had light scratches all over. The garage where I bought it from tried to polish them out, but they just created more buffer marks and swirls.
Scratch X is like a wax with a compound in it - I was worried about using this on metallic black, but works very well. I did my whole car by hand, which took a long time but it got rid of all the swirls and some of the minor scratches.
Pleasantly surprised at how good it is - need to get some more for the wifes car now !