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We had some Black Spray paint on the back side of our camper , I was able to use a Citrus cleaner and a "Grout" sponge and got all the paint off without any damage to the original paint on the camper, Then, I applied Rubbing Compound to the entire camper, and buffed it using an electric buffer.... cleaned up nicely ...
you can also use WD-40 to remove graffiti ...
Now that you've used a degreaser and rubbing compound on the finish, there's no protection left. If the camper exterior is fiberglass/plastic, since you've already cleaned and polished you can use a product like 303 Aerospace Protectant or 3M Marine Polish as a last step product. Duragloss #501 Marine/RV polish works very well too, and it does have some cleaning ability.
I really like the 303 Aerospace Protectant, it works really well on your car interior and engine bay as well. It doesn't leave that greasy/shiny look like a lot of other products, and doesn't attract dirt since there's no residue.