Congratulations on the Full Timer Life, it sounds like fun. I too wish the snow would just leave. MN weather has been brutal this year. :E About the roof, I found a product several years ago called ProSol Bugs R Gone. Don't let the name fool you. I found it at a camping show. The sales men told me the product does way more than removing bugs. And he was right! First and foremost it removes the bugs fast, but secondly, I love how it cleans the roof and siding. He was also right when he said it will not remove wax or harm decals. I am sure there are great products you can find that will work for you, but I have one product I use for everything. It's a space saver!