If you know where a Blue Beacon Truck/Trailer Wash is .... that would be my recommendation. At $15.00 for an extra high 24' Trailer (...but it's been a couple of years since I've been to one) they did a great job of removing streaks.

Be careful with the Awesome!!! I used it on my camper full strength and over a period of 4 washings, it was beginning to show the silver aluminum under the paint. I should have realized it when I was rincing it and the white was coming off. Yep, it REALLY works.