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This is only to share from my own personal experience. I wash the exterior with some kind of "Wash 'n Wax". Then in addition I wax ONLY the front cap in order to make it easier to clean off bugs after each trip. If it needs it I will often wash and/or wax the front cap because of heavy bug deposits, even when I do not wash the entire unit. Our Montana will be five years old next month (May). The liquid wax I have used is McGuires Tech (or something like that--it's too late at night for me to go out to be more specific.
The significance of this is: our graphics are in almost new appearance. In fact, I wax right over them. Less frequently I wax the rear cap. I have never waxed any other portion of the trailer.
I probably do not need to repeat that I have chosen to use the Thetford roof cleaner, and we have never had black streaks.
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