Vinyk Graphics are all the same: the only differences are in their size, and the tenacity with which the adhesive tries to ruin your life!
Use a hairdryer, and add enough heat to soften the glue, but NOT enough to weaken the decal itself!
If you do: it'll continue to just come off in Thumbnail-sized pieces, and you'll spend a lifetime removing the damned things...
Take your time, and peel them off in the largest pieces possible: it'll make your project go as smoothly as it possibly can!
I've been involved in some pretty extensive graphics package installations and removals...
http://www.thorforums.com/forums/att...1&d=1546353224