"Dirty Old Cars" follows the passionate owners and staff of three different detailing shops: Unique Classic Cars in Mankato, Minnesota; Visual Perfection in Morganton, North Carolina; and Red's Detail Co. in Marietta, Georgia; as they hunt down dirty and often unrecognizable 4-wheeled gems. The teams then either buy, clean and flip or clean for hire some of the most disgusting critter-infested cars in the country. Each half-hour episode features two "before and after" reveals as viewers witness jaw-dropping cleaning processes and amazing transformations that make these cars sparkle like new.