Also use C2v3 on all my glass although currently got another glass sealant on atm that I'm trying out for a detailing company, but both provide good protection, and as said the lubrication of screen wipe is the way to to it.
Ridiculous to drive around at this time of year in challenging light conditions and darker evenings with a rear screen you can't see out of. In this case, if the 'detailing' is at the expense of driving safety then it's gone too far.