I got the wallpaper off by spraying a mix of vinegar and hot water on the walls. Then scraping. However, alot of glue still remained. Here is what I did...
In a 5 gal bucket I put 1 gallon of boiling water and 1/2 cup of TSP. Wearing heavy rubber gloves, I scrubbed the wall with the abrasive side of a scotch brite sponge wetted with the solution. Squeezing the sponge a little over the tough spots helps. After a while the solution cools and dirties and it is time to start with a fresh bucket of solution.
Yes, i did mean boiling water - the rubber gloves must be thick enough to insulate your hands.