Without frequent washing, a car's paint job will start to crack, allowing the herds of tiny horses that power the engine to escape. Keep motors comfortably cantering with today's Groupon: for $99, you get a platinum auto-detail package at Jim Thompson Chrysler (a $199 value).

Jim Thompson's full detail department rejuvenates motor vehicles to gleaming shines with detail services that make over cars' exteriors and interiors. Buggy bathers meticulously hand scrub and dry each car's body, carefully washing away dried-on mud, bugs, and gummy bears. A full rim cleaning and tire dressing refreshes wheels, and a complete interior shampooing and detail polishes the dash, scrubs the carpets, and annihilates seat stains. Finally, the two- to three-hour detailing culminates with a full wax that helps guard paint jobs. Meanwhile, a free shuttle service ferries auto owners to and from the detail shop, allowing them to wait out their car's service at their houses, apartments, or bouncy castles.