Quoted from Williampinball:Hi all I am trying to fix a pinball plastic ramp that has some deep marks scatches ,does anyone know how too get theses out ,wetsand then buff ? Not sure ,what's the best way too do this ,thanks for any help
Flame polishing might be what you are looking for.
Search on here, and on Youtube for instructions and videos. Try it and practice on some junk before you mess with a ramp from an actual game.