I heard good things about the Aero Cosmetics Dry wash and wax kit. It used to be available on Amazon, but looks like no longer offered. Can get elsewhere though, like from here.
You can get a basic kit from Amazon still, A sprayer, 144 ounces of cleaner, and some microfibers. The big kit above has a pole mop, microfiber pads, and a bunch of other items to be able to clean the entire rig while standing on the ground.
If you want it to have really good protection, then you need to do multiple steps for a lasting effect.
First, wash it with a degreaser like Dawn soap in a bucket of water, then take a dual action buffer with some gel coat polish, I used this
stuff, worked pretty good and safe for decals. Then followed up with the 925 wax using the DA buffer to apply it. Once it dried, wiped it all down with microfiber towels.
I did this right after getting the 5th home from the dealer, but it sat on their lot for at least 6 months or more so was pretty dirty. After sitting on their lot over the winter getting repairs done under warranty, it came back pretty dirty again, but all the dirt wipes right off, so a quick wash with RV wash and wax is all it will take to keep it clean, slick and shiny. The first cleaning and waxing will always be a pain, will need ladders, and lots of elbow grease to do it right, but once that first one is done, the hard part is over, the rest is just normal washings. For washing I use Universal auto and boat wash and wax concentrate in my pressure washer using a 40* tip to rinse with and a foam cannon to apply the soap, and a long pole soft bristle brush to clean any streaks. I never get any closer than 18" with the pressure wand, and always direct it away from any seams, but I have been detailing cars and trucks with the washer for decades and never do any damage, just have to be careful where you point it. I wish I still had my hot water power washer, that thing was freaking awesome, only needed 1800 PSI and a few gallons of Diesel or Kerosene to clean anything with it. Hot soapy water and a hot rinse took dirt right off.