Just a tip from someone who has spent more than 100 hours removing
wallpaper:

Use plain water and let it soak in. If you just HAVE to scrape, use one of
the plastic putty knife things. Although, my favorite tool is a 99 cent
store metal spatula that has some sort of mystic qualities. Just be careful
not to gouge.

When you have it wet enough, it will come right off. It takes time,
patience, and a gentle touch.

There is NO fast easy way to do it.

YMM(and probably does)V

Steve