How to remove excess dried wallpaper paste?
I removed wallpaper and washed the walls of the melted paste afterward. But there are strips of excess paste that is hard and dry left over. At first I thought it was black mold but I've had it tested and have been told that it's wallpaper paste. But it's very hard and doesn't clean off with any regular methods for cleaning wallpaper paste. If I just try to dig it off, it takes the drywall paper layer with it. I'd like to dissolve it with something but so far haven't found anything that will soften it. The walls were prepared fully before papering. Has anyone ever seen anything similar to this? Any idea what I can use to get this off the walls?