i have removed wallpaer before using DIF and then washing walls to remove the remaining chemical. However, this solution is not woking on the wallpaper i'm currently trying to remove. Once i get off the top layer of the paper and the backing i am left with a rubbery, gummy type substance on the wall which does not melt like normal paste. Insted it rolls off taking the top layer of the drywall with it. Has anyone ever encountered this type of adhesive and how did you remove it?