Quoted from Rickwh:I tested using a plumbing torch to slightly melt the edges of a clear plastic. It worked pretty good to remove the cloudy edge and leave a shiny more transparent edge. Will take some practice. And it think it would work better on a sanded edge. But better than the unfinished edge.
I believe that's called flame polishing. There are videos on you tube and several threads about recreating plastics in the restoration section. Check them out. The decal method looks the easiest.