why not just keep the bird poop on your car too... ok yeah that was d1ck, but seriously you want rust on your car, there is nothing clean about it, literally.
in fact dirty cars actually get less mpg than clean cars (mythbusters) and you want to add a layer of rust to the front of your car.
if you want contrast in colors, paint your hood orange, but don't let it rust over... god this is one of the stupidest fads ever