Now with the majority of caravan roofs being a flat horizontal surface way above eye level, quite what purpose does cleaning it actually serve? I did the " inverted boat" roof" of our earlier vans, but they were very visible.
I do tend to feel many things that can be left alone, are best left so. Modern caravan roofs with the personal hazards, and potential damage involved, and no obvious advantage other than one of self-satisfaction, seems a case in point.
I don't clean the flat section roof of my house.