I use 3M sanding pads. They do a fine and super fine. That will take the marks out. Using a circular action. Then I use micro mesh which is a material sand paper and you can start using 2400 then 4000, 8000, and then 12,000 grit with a bit of water. Finish with Novus Polish 1,2 & 3
This is good to polish out scratches too.