Deep Clean Maintenace refers to what I'd like to call a "special projects service" designed for people with exceptionally dirty, beat up interiors, or for someone looking to flip or sell a car to maximize their profits in the sale. It's true you'll get more money with a clean car than a dirty one.This process starts by removing all the seats and assessing the situation on how to improve the look and quality of the interior: reconditioning upholstery and minor repairs, leather repairs & dying. Deep cleaning the floor boards, polishing hard plastics interior to remove/reduce/minimize marring. May have to take that step a bit further with interior sanding, surface prep,priming and repainting. Perhaps the steering wheel is worn out and ugly? That can be cleaned, filled, sanded, retexurized & repainted. Smaller interior details like knobs, compartments, arm rests, cubbies, shift boot covers, door handles, door panels speaker covers etc. can be  extracted from a pick-n-pull, order new online or repainted. Perhaps the hatchback felt/carpeting is so badly damaged, it can be reconditioned or replaced. Perhaps the Headliner is damaged, stained, stinky, sagging that can be dealt with too! Depending on the severity of interior damage, the size of the vehicle and how far you'd like to go with the repairs depends upon you and your investment! Of course this interior revitalization includes a High Class Exterior Detail with a new wax coating!!