polishing scratches out of perspex
If working with perspex, to produce a polished edge,
First file to shape.
Then start with sandpaper on a block polishing further to shape, & eventually
going to the finest wet & dry you can get.
At this point you have a smooth to touch, rounded edge which is dull & opaque.
Start on it with T cut or Brasso, & in a couple of minutes you will have a glittering, transparent edge.
Same for a "Plastic" windscreen. Mild scratches may be taken out directly with T Cut. Heavy "Chips" are impossible, without going through the process mentioned above.
Similarly to clean a windscreen or visor which has "Dulled" with age. Just polish with Brasso & it will come up perfect again.
I did one on a K1200LT a few months ago. Took several hours, but it was worth it.
Hard work though.
Hope this helps.
Myke