| When removing wallpaper in our house, we used warm, soapy water in a spray bottle. Sprayed it on the wallpaper, let it sit for five minutes (keep spraying if it starts to dry out), and then peel it off in great sheets.
If the wallpaper itself is shiny and repels water, you'll have to do it in two steps. The first step will be to just peel off the shiny layer, exposing the paper underneath. Then, when you soak the paper, the glue will loosen.
Depending on what's underneath the wallpaper, you may want to pick up a plastic scraping tool. It's the same kind of thing as you'd use for applying drywall compound, only made of plastic. I found that it was great at scraping off the gluey paper.
Once you're done all of that, the walls are likely to require a couple of good washes with soap and water before you start prepping for paint. Good luck with the renos! | 
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