Great advice! I just swabbed the roof with the same Dawn Detergent mix I was using on the exterior (after applying a UV protector). Seemed to work pretty well. I will pick up some brushes with long handles for the Spring version of this exercise. MOS is pretty cool stuff. Finally have a use for that big bottle I bought a few years back.
2011 Surveyor SP240, 1996 Coleman Sun Valley
2001 Suburban 1500, 3.73, K&N, Jet Chip, Magnaflow dual exhaust, Reese Dual Cam