Removing Very Old Wallpaper. Taping Knife Amazon 8. Scrape or wash off any remaining glue with trisodium phosphate mixed in water.
This is for the person with the old wallpaper. Lay towels or old blankets over the plastic for extra protection as stubborn wallpaper takes a lot of water to remove. Be sure to wipe the wall down with the warm wet sponge or cloth after scraping a small section to wipe off the residual glue from the wallboard.
Allow a full day for removing wallpaper from an average-sized room.
Once all the paper is off youll be left with little specks of wallpaper residue on the walls. As you work remove as much glue with the scraper as possible as well. When walls settle wallpaper sometimes tears in a corner. Once all the paper is off youll be left with little specks of wallpaper residue on the walls.