I use a telescoping brush that the handle extends to 6'; that and purple power (or whatever it is called) that contains TSP works perfectly for me.
I wet the surfaces, spray the purple, the brush until most bugs are gone.
Rinse, rinse, rinse. If needed, a spot spray gets the last of the bugs.
Some folks recommend only products formulated for RV use, and fear the TSP based cleaner will remove the finish. I've never had an issue with these cleaners but I do rinse well.
That said, use what you feel is right for you.
I've never waxed any of my rigs, but I keep them clean and out of the sun when not in use. Our Sunseeker still looks almost as shiny as it did when we purchased it new 7 years ago.
