A new type of adhesive that can be cleanly removed from plastic bottles and packaging ... describes how researchers designed and generated a polyurethane that incorporated sulfonyl ethyl urethane ...

This included everything from epoxy to wood glue and various adhesives for plastics TL;DR: Some superglues seem to weaken PETG, and a construction polyurethane glue is the absolute winner.

This helps the glue stick to the windshield. A urethane glue is then applied along the edges. Urethane is used because it cures quickly and weather seals the glass. More from Transportation ...