The message
from asalcedo contains these words:

What is the best way to fix the mirror back to the windshield? Is there
a special type of "glass" glue?

I've tried many over the years, and the one that I've stuck with (Ha ha)
is the Loctite one which comes with a small tube of glue and a plastic
mesh which contains the catalyst. Works every time and, so far, has
never dropped off again.

Tip: Warm the screen locally with a warm hot water bottle on the outside
of the screen. Goes off quicker.

--
Skipweasel
Pay no attention to that man behind the curtain.