mark davis :
This is not a satisfactory answer to your question but I think it is worth thinking over.
Why focus on full details except at the wholesale level ? When you sell a full detail, you lock yourself into perhaps 4 hours of work and must try to keep your price down to what a customer is able or willing to pay. The customer often has no idea of the work and time involved and consequently under-values what you do. You are expected to deliver perfect work, at least by some customers.
I think the detailing concept should be scrapped in favor of a set of separate car cleaning services, the price of which would add up to more than a full detail, hence more profit per service.
I can just imagine a series of late night T.V. commercials for a local shop. The ad would go like, " Spilled coffee in your new car? Hurry over to CAR CLEANERS for a professional auto carpet cleaning. We'll vacuum, remove spots and stains and then shampoo the entire carpet the same way a pro cleans household carpets. It's only $99 for most cars !
Visit CAR CLEANERS for all of your car's washing, waxing and interior appearance care. "
Of course you can explain in person that pressure washing floor mats and shampooing seats and door fabric are separate services done for an additional charge. Show them the menu.
Doug