Tint removal?

Any one have suggestions for removing window tint? One of the previous owners covered everything rear of the windshield in two layers of purplish-blue tint that's separating from the windows and, IMHO, it looks terrible.

I've done it before on another car with a razor blade for the tint and scrubbing for the adhesive, is there an easier way?

Wall paper removal! Or a whole lot of razor blades, use with a handle and a carpet cutter razor blade, (covers more area)... good luck!