I typically do nothing on the windshield due to experiences with the wipers chattering. On the side and back windows I've been liking ceramic detail sprays. I clay and sometimes polish if needed. I apply something once a month or a few days before a rain.
I've been playing around with the H2O + OCW. I've noticed more slickness when Polycharged than just OCW alone (at least after the intial removal). With regular QD's no noticeable difference. This is all based off early testing, so we shall see...