Products like Spic & Span, Zud cleaner, Soft Scrub, things with chlorine in them followed by a good rinsing followed by a washing with an automotive liquid soap & soft brush followed by rinse, rinse, rinse finished with an RV rubber roof preserver as per instructions.
Did I mention rinse thoroughly between steps?
When finished admiring your work get off the roof & start on the sides cause you know where all that stuff off the roof went don't you. Any wax you had on the sides is now on the ground. Time to wash & wax the sides.
You sure you want to do the roof?