There are a few ways to remove it. As per Steve:, I don't think the 'application' of plain water will work (unless you KNOW the 'glue' is made from flour and water. This is sometimes used as a Home Remedy for 'glue' but don't bet that this is what you have.)
Here's a recent post where I 'talk' about the process. You can search the Forum Page for the keyword wallpaper yourself until you find the post(s) that talk about wallpaper removals. One of mine is at How To REmove Wallpaper.