Vacuuming the seats, headliners, rear cargo compartment, shelf, and trunk is the first step in interior detailing a car. An air compressor can be used to reach regions that a vacuum can't reach; brushing and steam cleaning are helpful and sometimes used to produce the best results while cleaning the mats and carpets especially for more severe interior details. Simply doing all of the groundwork makes a big difference in the way your vehicle looks and feels. This is only the beginning from touching every surface on the floor to touching every single plastic in the vehicle.