You all can skip washing the roof of your RV if you want. All I know is, if I don't get mine a couple times a year, I start getting all kinds of black stuff streaking from the roof and down the sides. When I keep it clean, I very seldom get the black streaks, or at least if I do, they are mild.
Don't know about yours, but mine gets covered with bird poo and farm dust. I live in the country. I have fields all around me. Dust when plowing and disking the fields; dust when planting; dust when cultivating; horrid dust when combining. Beans are horrible. Looks like a dust bowl being kicked up. All that stuff lands all over the camper, roof too. It get's mixed with dew in the morning, and next thing you know, corn dust is glued to the roof, and the sides, and every where else. If you live in town and park your RV in a storage facility, you probably won't have that problem. But live where it's dusty, dirt get's kicked up in the air from all directions for miles and miles, and things DO get dirty! Yes, our house get's dirty too. I wash the vinyl siding once a year too on the house. Car windows are hideous if the vehicles are not parked in the garage. A farmer can be working one of the fields a mile away and the wind will blow the dust right over us. It's part of country living. So YES... my roof needs washed, as does the sides, the windows, the vehicles, and even the siding of the house!
