I think that what it is anyway. Yesterday we were washing the outside of the 5th wheel when I noticed a dirty patch at the top/rear area of the roof. I got the out the ladder and tried to scrub it with a sponge but no luck. It was hard as a rock. Any idea on what could be used to remove this?
2018 Ram 3500 Laramie Longhorn 4X4 Dually Cummins Aisin CC LB / B&W Companion hitch
50 Gallon Transfer Flow in bed tank w/ Trax 3
2018 Montana 3121RL