overspray removal on canopy
I would NOT use acetone!! That would definitely mess up the part! I would suggest some Testors Dried acrylic paint remover. I use it all the time to clean brushes and it seems to work on all kinds of paint. I would put a little in a cotton swab and gently rub on the paint until it is mostly wiped off. Don't scrub hard, just rub lightly to loosen the paint.
Once it is down to a slight film, get some Novus #2 plastic polish. It looks a little like liquid car wax without the silicones or wax. Rub at it with a finger tip until the haze is polished off. Then buff the rest off with a paper towel.
The Novus #2 is a mainstay tool for me as it works for all kinds of things. I have used it on canopies, removing scratches from DVD's, any plastic which needs polishing. Always handy to have around. Works much better than toothpaste. As an alternate you might try automotive polish for paint. You don't want to use car wax but a liquid polish without wax in it is always handy for the hobby.