I wipe mine after a cleaning with the Meguiar's "Clean, Shine, and Protect," or whatever they call it now. Black bottle. It's water-based, and yes, the stuff comes off in a hard rain, but then this city is so filthy the entire car looks bad after a rain. CS & P goes on shiny but dries to a matte or satin black, not sleazy or wet-looking at all.
Plus I can use the same stuff on the vinyl inside the car and the rubber air dam under the front bumper.