#3
Mask around them, scrape off what you can with a razor blade and get more with Scotch Brite pads.They’ll get scraped but can’t look worse than they do now. You could probably sand lightly with high-grit sandpaper and then buff with a Dremel and buffing wheels.
#4
Take a Stanley blade, wrap soem masking tape around the ends and use the exposed bit in the middle to scrape. Should get a fair amount off, then try something like scotchbrite to carefully remove the rest.