I use the same swirl mark remover as Rdr4b. But for deep scratches I first use automotive wet or dry sandpaper starting with 400 grit and moving on up to 1500 grit and a lot of water and elbow grease. Then I polish with the swirl mark remover.
Use the Tork-909 car polishing pads. You will have to get them at an automotive paint store. You can get the wet-or-dry sandpaper and polish at the same time.
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