Automobile detailers specialize in providing a thorough cleaning of an automobile's interior and exterior. Polishing, waxing, and vacuuming are common techniques used by auto detailers in an attempt to make a vehicle look as close to new as possible. They must provide care for windows, wheels, paint, rims, and interior upholstery. Detailers must have a good understanding of the various waxes, polishes, detergents, and degreasers they may be required to use on the job. Clay bars are often used to get rid of any embedded particles that other products cannot touch. Interior cleaning is usually done with a vacuum, but steam cleaners and brushes can also be used.