You are better off applying a good automotive car wax once a year yourself (if you are physically able to). Save a lot of money. The Pod shell is fiberglass. It's much more important to make certain the edges are sealed correctly to keep water from intruding into the wall structure.

 I have only waxed one time since buying my Pod in August 2012. I used Klasse All in One, I have for over 20 years on my vehicles. It just works very well and I only do it twice a year on the cars.

 The Pod gets dusty and dirty, but a good rainfall cleans it off. I don't have any trees near where I park the Pod, so it's never been a big problem. I have used the black streak remover on a couple occasions. I guess the rubber window and door trim moldings are not exactly automotive grade. Only on a camper have I ever seen black streaks.