Fold a sheet of coarse sandpaper in half. Run the sandpaper over the surface of the wallpaper using medium pressure. As the sandpaper loses its grit, turn it to expose the unused side. Wipe the sandpaper over the entire wallpaper surface.
Fill a spray bottle half way with water and the rest of the way with liquid fabric softener. Spray the wallpaper generously with the solution. Allow the solution 20 to 30 minutes to loosen the wallpaper.
Scrape the wallpaper from the wall with a wide putty knife. Starting at the top of the wall, position a wide putty knife facing down and run it under the wallpaper. Scrape down to the floor. Place the removed wallpaper into large plastic trash bags.
Mix water and two tbsp. ammonia in a bucket. Wash the walls with a large sponge soaked in the ammonia mixture. Rinse the walls with cool water and the sponge. Dry the walls with rags.