It better make a difference after all the effort but I guess with new cars it's too noticeable.
Yeah with new cars there shouldn't be much in it. I bet if the 2 cars were much older it would be really easy to tell which ones have been properly cleaned. It's pretty hard to make a 3 month old car look bad anyway, that's what I'm counting on, I'm a bit lazy when it comes to cleaning
And yeah I would think 2 layers of wax / polish would be good. Think of how people get really shiny shoes, it's just layer after layer of polish.