I just removed wallpaper using Dif. Following the directions, I washed the walls thoroughly with warm water and a sponge before priming with a tinted primer. However, it seems that much of the paste remains, and it's showing through the primer as dark splotches. What should I do? I unpapered (is that a word?) and painted my bathroom the same way, and didn't have this problem. Help!

Thanks,

Linda