I actually have a used one in my warehouse in southwest FL. The machine as built had a high pressure wash, rinse, wax, and foam brush. It came with a rotary switch and electronic
coin acceptor. I have mixed feelings on these things. You find them mostly in apartment complexes. I sorta dislike them because they compete with brick and mortor washes where an owner spent a lot of money to build a business that had all the ammenities and complied with all EPA regulations. Before you put one in, check to see that it's legal. For instance, where will the waste water go? To me that's the big question.