You can remove light scratches with “Polywatch”.
How does it work ?
1.Apply PolyWatch to the watch crystal.
2.Polish the scratched areas for 2-3 minutes with great pressure at a right angle to the scratches, using a piece of cotton wool.
3.Finally, remove any remaining PolyWatch with a cloth.
Note: If you have deeper scratches on your plexiglass go to a watchmaker.