Roll a specialized perforation tool over the entire wall. This tool pokes tiny holes in the wallpaper without putting holes in the Sheetrock. If the wallpaper is a porous type, perforation isn't required. Regardless of type, perforation always helps the water and adhesive remover penetrate beneath the paper.
Steam the wall with the wallpaper steamer. Begin in one of the top corners of the room. The steamer will blow hot steam into the perforation holes. The steam will also help deactivate the wallpaper's adhesive backing. Hold the steamer on a spot for 20 seconds and then move it.
Peel the wallpaper away from the wall with a putty knife. Start in the corner and peel the wallpaper away from the wall where you've steamed it. Repeat this steaming and scraping process until all wallpaper has been removed.
Spray the wall with an adhesive remover and wipe the deactivated adhesive off with a dish rag.