[RickM]

I've used "Diff" with good luck. It contains a solvent that dissolves the dried glue. In the past many have successfully used a solution of warm water and vinegar to accomplish the same. The Paper Tiger is good when you have many layers OR you want to remove a non absorbent wall covering....Vinyl, foil, plastic etc. The holes created by the Tiger allow the solvent or steam to get behind the paper and do it's thing. The tool should not be necessary for paper or other absorbent covers. As mentioned by others use the Paper Tiger sparingly.
The fun begins when you have to remove paper that's been painted over.

Good luck!