Auto detailing is the practice of performing an extremely thorough cleaning, polishing and waxing of an automobile, both inside and out, to produce a show-quality level of detail. It can be practiced for personal satisfaction, and it is also performed to prepare a car for a Concours d'Elegance (often shortened to just Concours), a car show that features the appearance of cars. Elements of exterior detailing include claying, polishing, and waxing. Interior detailing involves the cleaning of the interior of a vehicle using vacuums, liquid cleaners, and brushes. Engine detailing involves cleaning the engine bay area of dirt and grease by using degreasers and all-purpose cleaners.