x4 NuFinish... it has just enough solvent in it as well to remove tar, tree sap, and road grime that the wash and detail missed.
Here is a added bonus: You know that white plastic that the grab handle (right by the entrance door) is made of? You know the handle that has not been white since you owned the camper two months. Hit it with a little NuFinish on a moist soft rag...presto - Factory new! This holds true for propane tank covers, awning parts, and type of vinyl/plastic.
NuFinish is my first go to for tar spots on our vehicles... it works like a compound and a solvent... must be why it waxes so good...