Can polyurethane be safley removed past its sell-by date of wallpaper lacking dangerous it? WE PAINTED THE STAIRS WITH POLYURETHANE AND SOME GOT ONTO THE...

WE PAINTED THE STAIRS WITH POLYURETHANE AND SOME GOT ONTO THE WALLPAER NEAR THE STEPS. DOES ANYONE KNOW IF IT CAN BE REMOVED SAFLEY WITHOUT AMAGING THE WALLPAPER? IF SO HOW?
Bedroom redecorate?
Answers:    If your wallpaper is vinyl start with rubbing a short time lacquer thinner on a Q-tip to be safe, although it should work fine. If your wallpaper is in actual fact paper I'm not sure, lacquer thinner might be too strong.
Paint brushes?
Unfortunately not.Your best to walk off it.
I'm getting married soon & want to do...