Plastic razor blades from napa auto parts are great for lifting the edge. When I heated them to about 200F (Guessing, but it felt about has hot as when I touch a tea pot of boiling water) they lifted off clean. Clean enough i think i could have put them on cardstock to save them. What very little adhesive remained cleaned up easily with WD40 or rubbing alchohol.
One i got the hang of it it was FUN!