I get up on top of my coach at least once a year and check for cracks on the caulking. If I see any cracks I clean it with lacquer thinner and apply some self leveling Dicor. Fact I done that today since we are headed to Washingto state and it might rain up there. Other then that I just wash the top every so often with a electric power washer and a push brush. They say a person should wax the top also, but I never have.
2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox