What 'complete' actually covers
Exterior: wheels, wheel wells, and tires; foam pre-soak and two-bucket wash; full clay-towel decontamination; ceramic spray sealant on all painted surfaces; exterior trim restoration on faded plastics; glass polished inside and out.
Interior: full removal and separate cleaning of mats, complete dry pass and crevice detailing, hot-water extraction of carpet and cloth upholstery, leather cleaning and conditioning, stain treatment, deodorizing, and a low-sheen finish on every hard surface.
Engine bay: a careful degrease with sensitive components protected, followed by a dressing that leaves plastics dark instead of greasy. This is often what makes a private-sale buyer decide the vehicle was cared for.