Do you know what it is? Mold/mildew? Looks like you are in Thomasville, GA about an hour from where my daughter and grandgirls live (one's boyfriend is from Thomasville). I've seen lots of trailers down there that have the black/black green "stuff" all over them from just sitting in that environment; I assume Thomasville is the same way.
Not knowing exactly what it is, I would suggest trying Starbrite mold and mildew remover. It's primarily for marine use but it has worked very well for us on several different applications outside of marine equipment. I get ours from Overton's but I'm sure West Marine or some other marine outfit would have it. Give it a try and see if it won't get that off there. Good luck.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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