It was definitely not boiling but hot from tap, so could be about 60°C, and, yeah, somehow the windshield did survive it. It's probably not that bad because you

It was definitely not boiling but hot from tap, so could be about 60°C, and, yeah, somehow the windshield did survive it. It's probably not that bad because you actually pour the water on the frosted windscreen so most of the heat would dissipate already before actually reaching the material.