I'm sure that this will likely be too harsh, but brake cleaner does a bang up job. I used it to wipe off sharpie pen marks from the exterior of the trailer (long story! Needless to say it DOES NOT work like dry erase pens )
We used brake cleaner and it removed the sharpie pen, and the layer of gray grime that was beneath it. Trouble is, we have a trailer with one bright white spot now.....
I knew someone who cleaned and clearcoated the aluminum roof of his enclosed trailer when he bought it. He had minimal black streaking problems.
Unfortunately, it's the nature of the beast when you have the aluminum roofs like that. Regular applications of the black streak remover and washing do seem to help keep it somewhat at bay.
Stephanie Funk
<Couple of NARRC and NERRC bragging things here>
HP Honda CRX in progress, ITB Honda Civic, ITA Honda CRX, ITC Honda CRX
"Green Booger Racing"
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