Removing Washable Wallpaper: This job is messy but with older wallpapers, it is the only way to get the job done, except to rent a steamer to steam-strip. (If you are interested in steam-stripping, you can rent a steamer at major home improvement stores, or look up “Wallpaper Removal” in your phone directory to find local companies that either rent steamers or will come and do the job for you.)
In order for water to penetrate the paper when you remove it, you have to break through the plastic film that covers the wallpaper by using a scoring tool to make small holes in the wallpaper. After making these holes in the paper, spray the paper liberally with a spray bottle until the paper is soaked. Spray water directly into the slits so that the water can saturate behind the plastic film.
After soaking for about 10 minutes, you should be able to scrape off the paper with a putty knife. Finally, be sure to wash down the walls to remove any residue from the glue before you paint.