Heat gun or safer bet is hairdryer. Heat the plate & backside of the glass. (assuming mirrors are removed from mounting plate) I used a very thin metal shim and putty knife to get between the glass and plate to tell when the adhesive became soft. My mounting plate was slightly wedged under the rubber window mouldings. A push from the front corner, pushing the plate towards the rear of the car, it came off easily. First side took 15 minutes & the second side was about 5 minutes (reduced fear factor). GM adhesive remover did a good job of removing adhesive residue. Once the heat hits a certain temp, the adhesive releases. My mirrors were mounted in 1989.
IndyDave
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