I can say that I have never lost an account and a few accounts even said that I was the best pressure washer they have ever seen. Maybe they are just sucking up. The way I see it is if I wash a white truck and go back and rub my finger on a spot and it squeaks and doesn't leave a mark then it is clean. And it can't come any cleaner. Now on the aluminum I have a guy with a pump up and spray that if needed. That may be the only thing that 2 stepping can do for me. But with two stepping you have to go over it what, 2 or three times and then rinse. With someone brushing you go over it once and rinse. I have put two guys that two step out of business too. But it all boils down to who is the most caring about their work and who is the best with the people. For me this way works better because I have two stepped and it isn't as fast as this.