I learned from some friends last night that their puffy-haired cat cannot feel raindrops hitting it from an open window. So, sprayer deterrence
is probably even less effective against her.
We knew a stray (possibly feral) cat named Dirrty Puff (named by Katt) back in 2009. He had this long, inconvenient-looking white fur. He was completely uninterested in people, unlike his friend Bonus Cat and 100% committed to independent living.
It now occurs to me that the fur was a big advantage when it rained and really help him maintain his lifestyle.