Easiest removal of old wallpaper 3-4 layers thick on horsehair plaster

http://www.house-painting-info.com/articles/removing-multiple-layers-of-wallpaper/#.WfyIOFKZPVo

you are doomed. They probably did not use sizing to protect plaster. I ran into a problem when the former home owner applied cheap wall paper over drywall she did not use wp sizing. (They were hiding damaged drywall that husband took off a job site) What a nightmare - the pieces came off inquarter sized portions and the drywall paper came off too. I tried everything. Probably the best was to steam it off. Just be careful you don't get plaster overly saturated - you might want to consult a professional for advice. I will never buy another house with wall

paper.

There is going to be nothing easy about this job, but I would use a professional steamer rented from an equipment rental place.

Spray the wall with hot water, keep it wet for several minutes, then start scraping. The wetter the surface, the easier the removal. No added ingredients are needed. A large sprayer is much better than trying to use a small sprayer that once held cleaning solutions.

Have a 100+ yr old house. Plaster wasn't horsehair. Layers of wallpaper and paint. Best investment I made was a wallpaper steamer. Wet a portion of the surface with warm water and let it soak in. Apply the steamer. Scrape away keeping the surface wet. Then rinse the wall with a vinegar and water solution to remove any remaining glue residue. Move on to the next area.

Start with a paint tray, fill with hot tap water, you'll need a long handle to attach the roller. Dip the roller in the paint tray, drag off excess. Roll the wall from the bottom up. You'll need a large putty knife to scrape the wallpaper. Start from the bottom up, and when your done wash the glue off the plaster, with a hot sponge.