Don't bother. Automotive glass is laminated with plastic and glues to reduce shattering to something approaching safe; that's why windshields break into tiny squares instead of lethal triangles. Not only would that be an unrighteous pain in the body part of choice to melt, but the fumes from the burning polymers may well be toxic. If you feel the need to make beads from recycled glass, stick to bottles, broken drinking glasses or art glass, or even aquarium gems.
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