Obviously I do upstairs first! I trad bottoms as I have only started using wfp few months ago and saving on water as working out of an estate car.
I meant all of the up stairs, I would then say to turn the flow down a little, but you are new and rinsing well is good.
how many times have you cleaned these windows ? each house is different with wfp, you need to learn them all just like you did when trad and where to put ladder.
Anti frost is something I have never come across ever, but will look into that as never heard of it.