I start on the roof and work my way down. I use a car-wash brush for everything.
On the roof, I use Dawn Dishsoap, it does a good job, getting most of the black crude off the membrane. At the same time, I check all the caulking, if it is bubbling or cracked, I clean it extra well and apply new caulk. Or at least I did until I covered all the caulking with Eternabond. You should check the roof twice a year. This tends to be the #1 place for water leaks to begin.
For the walls; I prewash any black streaks and the front cap for bugs with a product called "Spray Power" by crown (no association, but I like it). I use it full strength, and the crude just slides right off. Then I use a car-wash soap with a wax. Just wash the entire camper from top to bottom. I have never waxed my HTT. I hate to wax, and when I am done it looks really nice.
As for the awning. If it is really dirty, I usually use Spray Power again full strength, roll up the awning and let it sit for 20-30 minutes. unroll, scrub with my car-wash brush, and rinse.
As for the tent ends; I wash them with Dawn dish soap also as needed, during the camping season. I have never applied anything else. I always have the bunk ends fully closed, when washing the rest of the HTT.
I know there is a lot of other products people use instead of Spray Power, such as "Awesome", something with Purple in the name. I have tried Simple Green. but I really like Spray Power. But I am having a hard time finding it lately.
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