Steve wrote:
I am redoing the bathroom which has a wall mirror about 1m x 1.7m
attached to the wall by spots of glue. Don't know what glue but flat
was built in 1991.
I estimate the mirror weighs about 30kg.
Any ideas how I remove it in one piece?

Gently "saw" through the adhesive with a piece of fishing wire. It
may take a while!
--
Selah