Not sure if this was mentioned before. People usually suggest a hair dryer. Use a LAMP. On my spare board I had a Tuniq and I wanted to remove it. I do not have a hair dryer (I am in college lol, doubt anyone on my floor has a hair dryer 
). Anyway I was scratching my hair out as the backplate is nearly impossible to remove without heating it up and thought to give my desk lamp a try. Worked great thought I'd share as it is much faster than a hair dryer and you can just leave it on do something else and voila it is off. Of course the best idea is to not put on the adhesive.