Lots of good information here. I've enriched Autogeek and Griot a bit based on some reading here.
I'm surprised that there is no mention of water filtration though.
I started using
one of these a few years ago and it was a total game-changer for my wash process.
I don't have to rush to dry the car with one of these as I did before. Absolutely no spotting. In fact, I can even skip the dry altogether if I'm in a hurry. Very highly recommended.