beppington
Elite Member
I think using a pretty fine sandpaper is going to be needed. Seems like rough sandpaper will leave scratches that you can actually see thru your work.
Sax.com and other art places have led versions for 40.oo, you might want to search them out before spending a whole lot of money.
If you don't want to scratch the plexi, place like Home Depot maybe(?) sell that self-adhesive window obscuring clear stuff that you can stick on your bathroom window or front door window to obscure the view. Pretty cheap, too.