Last summer when in Columbia Falls, they had one of their infamous dust storms. We all of sudden noticed, hey where'd the mountains go? It started to sprinkle and the Jeep's windshield turned to MUD!
When we got back to the RV, it looked like someone unearthed a relic of an age past. The CG graciously allowed us to wash it.
I knew that that the roof had to be cleaned and found out that the PO had NEVER done so. Nothing I tried would take off the underlying black goop, so four hours on my hands and knees with a lowly 3 by 5 inch kitchen sponge with a scrubby on one side and a bottle of Soft Scrub, I found out our roof is WHITE! My knees hurt just thinking about it.