Encompasses the processes and products used to maintain the cleanliness, hygiene, and condition of a vehicle's interior. This includes tasks like vacuuming carpets and upholstery, wiping down surfaces, cleaning windows, and treating leather or vinyl with protectants. The goal is to remove dirt, dust, and stains, prevent deterioration of interior materials, and create a comfortable and healthy environment for occupants. Interior cleaning and protection not only enhances the vehicle's appearance but also contributes to its overall value and longevity.