I've been working on the foam padding adhesive residue in our Albin Vega for many months, and it is the most tenacious stuff I've ever seen. I've tried every solvent known to man on it and probably given myself cancer, and the job is still less than half done. The solvents all work to an extent, but an enormous physical effort is required. Every square inch is a battle unto itself.
I haven't tried wallpaper remover though. I'll give that a shot.
@Whatfiero1 ... white bedliner you say? Tell me more?? I was planning to replace the padding with ... well ... padding, from Sailrite. But I'm all ears!