I am not a fan of "waterless" car wash methods. Why? The most critical part of any car wash is a complete water spray down, moderate pressure, to remove surface grit/dust. Unless you remove this first, you're creating sandpaper with your first wipe, regardless of the liquid of the "waterless" product.
All mechanical car washes have a risk: embedded grit in the cloth, harsh brushes (also with embedded grit), recycled water that's not filtered and has high salt (snow belt carwashes).
Chicago? Gotta be above 36-38f to hand water wash, below that, you'll just cover the car in a sheet of ice (been there, done that!).
(Click and Clack said, years ago, that the number one WORST decision, for the consumer, was when the auto industry decided to paint cars. They should have let them naturally oxidize! (early on, sheet metal was so thick, it took YEARS to rust through!) We spend gazillions of dollars on paint products, then gazillions more on maintenance of an outdoor painted surface that we expect to last for decades.!!!)
(all that said, I spray, then do the 2 bucket wash, carefully...on any painted surface.)