I stumbled on this great site today on all the cleaning uses vinegar has. Who knew you could Clean hardened paint brushes by simmering them in a pot with white distilled vinegar? Or how about Removing wallpaper easily by using a paint roller to wet the surface very thoroughly with a solution of equal parts white distilled vinegar and hot water?
You can check out all the other great uses vinegar has here.
(and I just love this vintage "vinegar essence" image...)