How about this approach for removing a mirror? I need to remove my mirror, too. I wondered if one might apply duct tape on the mirror's surface by running the tape from all 4 corners diagonally across to opposing corners. Then, edge to edge, run (lots of) horizontal bands of tape across the mirror and vertical bands up and down the mirror. Given the mirror is probably going to break anyway, pry the mirror off the wall with a crow bar -- the tape will hold the glass together and keep it from shattering and being so messy.