Having been doing this since the late 60's and now 'retired' I still use ANY of the 3 M Scotchbrite pads, color no matter as you have to press lighter ( get the touch /feel) bottom line is you have to polish out and remove any and ALL scratches from the finish first, then blend it "back" and matte it,,,you can also use "glass beads" , USED ones, and very light air pressure, again, practice and getting a "feel" for the finished look......
PLEASE, stay away from any and all power equipment,unless YOU know how or have ANY experience, you will "booger" the finish........