WD-40 is perhaps best known for cars and mechanical items but actually, this formula is also quite effective at removing glue from glass. Many households already have some WD-40 handy, so you likely have some of this glass cleaning agent already sitting around your home. \
Spray the formula right onto the sticky area and use a clean, dry cloth to gently rub it off the mirror in circular motions. Wipe the glass with regular glass cleaner to remove all traces of residue after this. \
This is considered by many to be a bit of a life hack. When you want to know how to remove glue from mirror surfaces, WD-40 is a surprisingly usable solution. \