I find that the best defense is a good offense. Once you do get it clean, use black streak remover, simple green or whatever whenever you notice a black streak developing. Clean trouble spots at least a couple of times a year and rewax the scrubbed area, preferably the whole unit. If you have stains that have set, you are probably going to need 80 percent elbow grease and 20 percent chemical of your choice. I'm guessing, even with waxing, the finish on a 2011 is losing its gloss and will hold stains better than wax. My experience is once the finish starts to chalk, it's an uphill battle to keep it clean and shiny short of a new paint job. Sorry, I don't know a magic solution. Maybe someone else does. If so, I'd like to hear about it too.
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2015 Crossroads Cruiser Aire CAF27RL, 2018 F250 diesel crewcab SRW 4WD short bed, Trailer Saver hitch with Reese adapter on Ford OEM underbed 5th wheel connector.
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