Cut criss-cross patterns through the wallpaper with the razor over the entire wall. Avoid cutting into the wallboard.
Spray the entire wall with the liquid wallpaper remover until the wallpaper is completely soaked. Let the remover sit for a few minutes to soften the adhesive.
Scrape the wet wallpaper from the wall in any direction with the wall scraper. Do not cut into the wall, which will be somewhat soft from the wallpaper remover. Do this until all the wallpaper is removed.
Soak a sponge in trisodium phosphate or a phosphate-free adhesive stripper. Rub the sponge over the wall to remove the leftover adhesive.
Soak a clean sponge in water and rub it over the entire wall to rinse away the trisodium phosphate adhesive stripper. Let the wall dry completely before refinishing.