The Safelite Auto Glass people are gonna love that windshield.
I'd hate to have need be washing THAT window. Do you have any idea how much time drivers have to spend, just washing the windshields? It's a PITA, everyday, for over-the-road long haul drivers.
If there might be rain ahead, wash the windows first. Get those bugs off (Spring-Summer-Fall) and the grime too, before getting under the rain. But if not --- whatever you do when the rain starts, particularly if it's only light to moderate -- DO NOT turn on the wipers until the stuff on the windshield is well hydrated.
Like I used to teach trainees, do not look at the water on the windshield, look through it and past it as long as you can stand it.
If the windshield wasn't reasonably clean (like--only a few hours or half a day of driving since last washed) then turning on the wipers, even with decent blades and washer fluid, can be regrettable.
Looking through a dripping wet windshield is clarity itself, compared to trying to see through smeared bugs and gunk.
The whole thing looks like a bird/bambi/rock magnet to me...