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Sorry I don’t agree it’s either clean or it’s not , there is no halfway point , the 3 cleans comes from people trying to buy time doing a poor job due to inexperience , or poor techniques , or poor water quality, or all three , , if doing a very dirty first clean it pays to use a chemical like virosol , give it a good scrub rinse with garden hose getting into all the nooks and crannies blasting out all the dirt ,then go over again with pure and rinse job done you won’t get any cleaner than that , hot water will give better results and be quicker as well .Don't think anyone is talking about doing less that a thorough job with high standards...it stands to reason, the first time you clean a window in years it *may* not be as good as the second/third iteration. It's unlikely to get progressively worse so begs the thought that it might get better (second time at the vents, second time the sill recess with years of compacted dirt hidden away that only comes out when you've moved on, the stubborn baked on bird mess long washed off but left a barely noticeable, from the ground, faint shadow...the custy WILL see things you can't possibly - this caveat just covers these rare but imo likely scenario.. I guess the advice is for newbie not pros like yourself and newbies can do with all this help...in fact I would not be surprised if my initial clean spiel came from that post... ?
(to depersonalise it) if someone washed their car for the first time in 3-4 years it's unlikely to be as clean as the 2nd or 3rd time they clean it subsequent months, it would in 99% of cases get iteratively cleaner... surely.