Mythbusters Dirty Car vs Clean Car Episode. Jamie, Adam and the gang comes back to test a myth. This time, the latest episode that will be featured on Mythbusters is the Mythbusters Season 7 Episode 14 Dirty Car vs Clean Car. In this episode, the Mythbusters groupd will test the myth about What will get better mileage? A Dirty Car or a Clean Car? And also, they will test the More Hangover Myths. This is going to be a science packed episode. Will the Myth go busted? Will the Myth can be confirmed or will just be plausible? Find out and Watch Mythbusters S07E14 Dirty Car vs Clean Car