Across America, under layers of dust, mold and mud there are forgotten cars waiting years for someone to revisit their history and give them the one thing they need to get back on the road: a good bath. "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.