DIF is a highly rated commercial wallpaper remover, and diluted white vinegar is an effective homemade alternative. Both products also require use of a perforating tool and a wallpaper scraper.
DIF wallpaper remover contains powerful enzymes that degrade wallpaper adhesive, making it easier to separate the paper from the underlying wall. This is a concentrated product that must be diluted with water before application. A mixture of white vinegar and warm water also hastens wallpaper removal. This natural, nontoxic solution loosens the wallpaper without releasing toxic fumes.
A tip for removing wallpaper is to run a perforating tool over the paper before applying the removal product. This helps the product penetrate the wallpaper and dissolve the adhesive beneath it.