i just used a hammer/chizle/flathead, left a lot of stuff, took a lot of time taking it off cleanly without denting/scraping the surface area too much, but it was worth it (got flooring painted) just try to chizle/scrape off as much as you can then use acetone to wipe/clean it off, i wouldn't suggest a wirebrush just because it leaves swirlmarks, looks uglier and it leaves more prepwork n such for paint.
