You could do like I do. I have a rotating brush attachment for my pressure washer. I have one of my kids hose down the 5er in front of me, and I wash the camper using the pressure washer (PW) w/ rotating brush. With the rotating brush, the PW will siphon a RV Wash/Wax & water solution. Gives a nice soapy bath. When I finish a section, my helper will go behind me and rinses the soapy water off. We can wash the entire 5er in a couple of hours.
One other trick...I open my awning, wash it w/ the PW, RV wash/wax and rotating brush. I make sure I have gone over the entire awning, top & bottom. With the soap still on it, I roll it back up. I wash the 5er and when completed, I open the awning & wash again. Letting the awning sit rolled up w/ the wash/was on it helps loosen up the dirt/mildew/mold and makes it an easier job to clean.
'04 Wildcat 29BHBP
'02 Chevy 2500HD
DMax/ZF-6 Speed, CCLB, 0-70-110 HP VA Tuner,
5" exhaust, H2 Tires/Chrome Wheels (315x70-17),
B&W GN hitch and 5th Wheel Companion,
BrakeSmart Brake Controller