I have the matte black on my 2012 and it needs to be protected from the elements, but I haven't put anything on it yet. I purchased some blackfire spray sealant to use on it. I've removed water spots and a little tree sap using APC and it didn't hurt the finish. As far as washing it, I'd just use the same process as the rest of the car as long and avoid waxes or sealants not approved for matte finishes.
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