I also used the DIF solution with hot water. . Also , do you use the
paper tiger tool that puts holes in the wallpaper? That helps a lot for
the solution to soak the wallpaper.

Yeah, I use paper tiger when necessary. The OP said the paper peeled
off so I didn't bother mentioning it. hmmm I wonder if the tan/light
brown stuff they're seeing is the paper backing?

SteveB Save your money on DIF and like products. Use a paper tiger
and warm water.

Normally I'd agree but sometimes there are wallpaper jobs from hell.
DIF helps on those.