I have always used a 50/50 mix of hot water and vinegar in a spray bottle. Use the same mixture to wash the glue residue off the walls.
Hi this is Peggy, I have removed wallpaper before and it is a slow hard job. We filled a spray bottle with hot water and fabric softener, make a slit in the wall paper and start spraying, peal it off . spray peal and spray. We also used a putty knife to strip the wall paper after it was wet, hard job good luck.