Is your RV fiberglass exterior walls? There are two types of fiberglass. The cheaper type is called "Filon" and it has somewhat of a slight texture. Or the real fiberglass which is very smooth. 99% of hybrids if not aluminum will be the Filon fiberglass. If I remember right the Roo's are Filon.
Either one you can use a product call "Gel-Gloss
" it's both a cleaner and a wax. Sold in 16, 32, 64oz or gallon size. The 64 oz. jug lasts me 4-5 years.
Each time I wash my trailer
I'll do maybe half a side, Or do the front cap just before a long trip. Keeping the front cap well waxed lets you just wash the bugs off. Their HD (heavy duty) Gel Gloss also has a added UV protector. It costs more, so I use that only on the decal areas. If you don't wax your decals, they will start to fad by the 3rd season.
To use, I have a box of terry cloth shop towels or old bath hand towels. Put a 1-2" dollop on the towel, work it in a area of 2 by 2' or 3' by 3'. It will get any black streaks off, tar, oxidation...you name it. I have even used it on a friends 1999 Aerolite hybrid that had not been touch for at least 10 years. I mean the filon was nearly black in color. Even brought the shine back. Now as you work the area, leave some on, let it dry / haze up for maybe 15 - 30 minutes, and then buff it off with another clean soft towel. So as you work area to area, each time you put another dollop of Gel Gloss on use another area of the towel. So a small 18" shop rag you might only get 10' of wall done. FYI: As in any wax, don't do it in the direct hot sun. If it's a 45 or 50 degree day, you can get away with some sun on the wall section your doing. You really don't want the wall surface "Hot" to the touch.
Now if you start to get a few "used" rags / towels all filled up with gunk. I'll put them in a 5 gallon pail and fill it with water, hot if you have it and wash them out maybe 5 times. It will take that many times to get the dirty wax out of the towels to be able to reuse them after they dry.
Over the 8 month camping season, I may get around my 26' hybrid 2-1/2 or 3 times.