I don't know if it would remove black stains but a 'clay bar' works wonders on vehicles to eliminate imperfections. A 'clay bar' is available at any automotive parts store, walmart and other box stores in their automotive department.
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2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.
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