Anyone know how to treat this dark trim, for instance if it should be polished and or waxed? Every time I take my car in for service the preference is to wash the car and this time this black trim came back kind of dull gray and kind of spotty. I forgot exactly what it looked like before, but I think it was darker and definitely not spotty. Hate to be fussy but I just don't want to be throwing something on there that I shouldn't because I know some trim on cars is meant to be flat or satin. Thanks.