Again, Novus makes products specifically for use on plexiglass, plastics, etc that are for both scratch removal and polishing. #3 for heavy scratches, #2 for polishing, and #1 for general cleaning and anti-static. Laser used to have it available, and VECTOR might also have some stashed somewhere.
The Novus products contain no solvents or harsh chemicals that would affect the other parts of the printers, so if we’re gonna try to fix instead of replace, go with products we’ve used before that are specifically designed for the job.