r/Campertrailer

Hello all. Looking for anyone’s advice on removing these black looking scuffs on our camper. Camper was covered for the winter, I pull off the cover in spring and camper is covered in these scuffs. Elbow grease and a microfiber seem to reduce them significantly. But it’s a giant pain the A**. I was skeptical of any sprays or chemicals that could strip the sealant off the side. I tried a wheel cleaner that was safe for use on plastics and paint… no dice…. Has anyone experienced this issue? Is there a miracle solution? Pictures are after I cleaned the camper.

Rewiring. Last screw point says white. I only have yellow. What goes where?