Hi, Linda. I have a couple of suggestions. You might want to try them and see what works the best and then let us know. The first is white vinegar, 2 cups to a gallon of water. The second is Tri-Sodium Phosphate (TSP) mixed per package directions. This is available in the paint department of major retailers and home centers and you should always wash your walls with it before painting anyway. These 2 suggestions are really cheap and available. A previous poster suggested that a product called "Dissolve" worked much better for her than DIF, but I don't know much else about it. There probably some differences between the pastes used at different times and by different companies and paperhangers.