I use my 4 gpm 4000 psi gas unit to wash the sides, with a 40 degree nozzel and I keep the head 18 to 24" from surface. I use the 40 degree head to go over it once, then I switch to a rotating brush that connects to the end and is powered by the water pressure to actually wash the unit. I then rinse back off with the 40 degree head.
Always use a stiff bristle brush on the roof. But I am going to have to try that Solvit cleaner, Lloyd's roof does look great!!!!
Daniel & Donna Leonard
2011 Ram 4500 SLT 4x4