Start by pulling at the mirror to test the strength of the adhesive and where it may be located.
Remove mirror from bathroom wall.
Prepare your work area for easier cleanup later.
Protect the sink area.
Cover the mirror with duct tape.
Spread a heavy.
Use a blow dryer to soften the glue.
Dress in long sleeves long pants and work boots to protect skin.
Lay down cardboard or plastic on any surface surrounding the mirror.
Dress appropriately to prevent any injuries.
You may want to use a heat gun and heat the mirror to try to soften and melt the glue between the wall and glass.
Maintain a steady pressure and listen for the drywall paper tearing loose from the wall.
You can also use a small heat lamp.
The duct tape will limit the amount of glass that drops if the mirror shatters.
Gently work along the top and sides of the mirror releasing a little bit at a time.
Quick tutorial on how to remove mirror from bathroom wall drywall or where ever.