Commercial mirrored glass question

Is wfp-ing mirrored glass more difficult for any reason compared to traditional glass? I just don’t have any experience with this. Looks like it’s been a long time since the windows were cleaned.

Treat mirrored glass, and ANY mirror just as you would a window.
The only real thing i can see happening is that any spots may be multireflected, but other than that, none that i know
Pax