How to get rid of soap streaks after washing a TT?

ZINGERLITE wrote:
black streak remove in the RV section at walmart. I also use Zeps orange clean on pretty much everything in my garage. Usually spray some orange cleaner on troubled areas before i scrub with the wash brush. Usually works pretty well.

Heavens, no.
Trying to keep a finish on the camper here, not take it off.

Wash in the shade, don't let the sun bake the soap or water spots on it.
No different than washing your car.
Leaf blower makes a good dryer too, for water spots.