OOOO Dif is the best! I just did 3 rooms and it was crazy. What I did was spray dif on the area that I was going to do, with a washcloth and warm bucket of water with a lil bit of dif in there. Wash the area that tou are going to do, you can see it get wet, then wait about 10 minutes and scrape off. This wallpaper that was up was put up in 1976 back then they used that icky wallpaper paste and it took that off. Good luck, because it is a BIG job!