Removing old wallpaper by using a chemical stripper to release the adhesive is an efficient way to accomplish the task. The procedure can be more complex and require additional steps depending on the type of wallpaper and the method that was used for its original applications.
Older wallpapers are typically printed, uncoated paper and simply applying the stripper to the surface, allowing it to soak in and peeling it off is a fairly simple task. However, many newer wallpapers have a vinyl coating or layer which makes them stain resistant and washable but also impedes penetration of the chemical stripper. It is necessary to separate this type of wallpaper at one of the corners and carefully peel off the vinyl layer before applying the stripper to the adhesive layer. You may also need to scrape the adhesive layer loose.