I've used this most of the last decade on all my cars and for valeting other cars,people phone me to ask what i've used on their windows as water doesnt stay on them lol..
Absolutely epic stuff..Don't need wipers even in storms,,soon as water hits the windows and your moving it instantly beads off ...Fantastic stuff if used correctly !!!
clean windows properly then apply to smear,then buff off with damp kitchen roll etc and then re-apply as before...lasts for a good month and even withstands jetwashing and like i said never use wiper blades unless stationary no matter how hard the rain....