[Keith 944]

powdered laundry soap. this works great as a wash and for streaks. i have also used purple power (super clean knockoff) but be careful with that, it can leave streaks. i usually mix the powdered soap w/ a little super clean and a car wash soap in a wash bucket with water and just wash one section at a time, rinse well. twice a year i will wax after this cleaning. works great on the motor home too...
friend had a white trailer and he used these so called streak removers, took white down to bare aluminum in spots. now cant do anything but repaint.
also i think that my next trailer i am going to paint the top white. this will reduce most if not all of the streaks coming from that area, and be a little cooler too...