A car with mud on the exterior tells passengers of rugged off-roading sessions, whereas a car with mud on the interior tells passengers of uncomfortable carpoolings with Swamp Thing. Pick your passengers wisely with today's Groupon to STL Mobile Detailing, serving locations within a 50-mile radius of zip code 63104. Choose between the following options:

• For $75, you get a full car detail at a location of your convenience (a $250 value).
• For $95, you get a large truck or SUV detailing at a location of your convenience (a $325 value).

The wandering washers at STL Mobile Detailing arrive at locations to scrub, steam, and restore a sheen to cars and trucks through a complex, dirt-defying 10-step process. The detailing starts as technicians hand-wash the exterior paint and trim with biodegradable cleansers and restore surface textures by removing particles of rust and failed invisible-cloaking residue. Swirls and scratches ebb away following a hand polishing, and a high-gloss aircraft wax coats the car's finish for lasting posterity and shine. Next, blasts of forced air search the undersurfaces of seats, the insides of venting ducts, and the insides of dash seams before deep brush vacuuming scours the crevices for sand, dirt, and unwound cassette tape desperately clinging to its relevancy. The freewheeling clean freaks then shampoo stains while carpets and upholstery sweat out their toxins during a cleansing steam, and all interior vinyl, leather, and plastics surrender their oils to a meticulous hand wash.