I worked in the mirror industry for more than 5 years and learned that vinegar can damage mirrors over time. Fumes can damage the bond between the silver and the glass. It is more shows up quicker on mirrors without frames. While this works great on windows, i would not advise using vinegar on mirrors.
RE: Fwd: Budget101.com : USES for vinager
If that doesn?t work I?ve used fabric softener to remove wallpaper.