Cover the room's flooring with plastic sheeting to prevent water damage. Cover baseboards and around windows with masking tape for protection.
Roll a wallpaper perforator over the entire wall to puncture tiny holes in the wallpaper. These tiny holes let the enzyme stripper quickly permeate the wallpaper and paste.
Pour 1 1/2 gallons of hot water into an ordinary garden pump sprayer. Add 2 ounces of liquid enzyme wallpaper stripper to the hot water. Thoroughly mix the enzyme stripper solution.
Diffuse the enzyme stripper solution generously onto the existing wallpaper, spraying down the wall. Only focus on a 3-foot-wide section of wallpaper for now. Let the enzyme stripper solution permeate the wallpaper section for 30 minutes to fully deactivate the wallpaper paste.
Remove the saturated wallpaper strips in the 3-foot-wide section. Peel the wallpaper sheets cleanly off the wall, starting at the top and working down. Leave any residual paste on the wall alone for now.
Continue stripping off each 3-foot-wide section of wallpaper on the wall, following the prior techniques. Prepare more enzyme wallpaper stripper solution as necessary.
Prepare warm water in a bucket to wash off the residual paste. Using a regular sponge, scrub the softened paste thoroughly off the walls. Rinse the sponge frequently in clean, flowing water.
Allow the walls to air-dry overnight. Meanwhile, remove the plastic sheeting and masking tape.