Its not been asked here, but if you need to remove a mounting thats glued to the windscreen with some sort of sticky pad the best way is usually to saw it off using a length of strong thread or dental floss. Slip this between the fitting and glass and cut through the sticky pad rubber using a sawing motion.
There may still be some glue residue to remove with suitable solvent . Also works for other items that are glued on with body trim tape but be careful the cord doesn't cut into something it shouldn't.