Any time you remove a windshield there is a big chance it will break.All it takes is a little chip on the edge and it spells disaster.I have help cut out a few at my friends salvage yard.
The way they do it is to use a piece of piano wire. It is pushed through the caulk from the outside and pulled back and forth with a person on the inside. Sometimes just the heat that is generated from the wire is enough to break it.
I am not sure about this,but I think most glass places do not like used glass because if it breaks they do not want to be held responsible.
Plus they are usually taking out glass that is already damaged so they probably are not all that skilled at removing it without breakage.
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