Fill a spray bottle with equal parts hot water and fabric softener. Shake up the bottle to mix the ingredients.
Spray the solution onto the wall that has backing. Let it soak on the wall for about 10 minutes. If the entire wall is covered with backing, work in sections of about 4 by 4 feet so the solution does not dry before you can get the backing off.
Scrape the backing from the wall with a 4- or 6-inch plastic putty knife. Apply more fabric softener solution and continue scraping until all the backing is off.
Wash the walls with a mixture of 1 cup of trisodium phosphate and 1 gallon of hot water. This will remove any remaining glue or residue.