I don't understand how its cutting corners? Perhaps our definition of cutting corners is different. I am not charging for a service I don't provide so I am not cutting any corners. I do exactly what I say I am going to do and that is what I charge for. I clearly state what is included in my packages and they are priced accordingly.
I have come across a bissell carpet cleaner, while not ideal it does allow me to add more value to my services.
At the same time, I could say anyone is cutting corners because everyone has a different opinion of what detailing is. There are guys who will disassemble the interior of car or remove exterior badging, plastics, spoilers just to clean them. They also price their work accordingly.
Just as a 'heads up'. Not a pro detailer but I do have some business experience and perspective. Listing the equipment and techniques you use is not necessarily being upfront, even though it may seem like it is. How many AutoGeek members take their cars to a detailer? Some, I'm sure, but very few. Yet these are your 'target audience' if you are trying to sell them on tools and technique.
If you tell your customer you are going to clean the interior of their car, they expect it to be clean. They don't know that the last detailer used a carpet extractor, nor do they care nor should they be expected to know. I see a lot of these detailers on this forum (and again, I am a complete NEWBIE to detailing myself, and no interest in being a pro, but perhaps that gives me important perspective) who advertise the products and techniques they use ad nauseum. Well, if you or I were shopping for a detailer, we'd be giddy with anticipation to find another 'geek'. But, we aren't likely to be shopping for a detailer, are we?
No, the majority of the market isn't going to care what products, techniques, or tools you use. They are just going to care that you get it DONE and that it looks great. I don't care if my mechanic uses snap-on, craftsman, or some tool from harbor freight. Just as long as the work gets done and he doesn't damage my vehicle in the process. Perhaps if I were a mechanic I'd care more about his tool brand choice. But then, if I were a mechanic, I wouldn't be taking my car to him!
I dunno, just my $0.02. I think, if you are interested in being very upfront (and good for you), then you need to be clear. They don't care or know the difference between you using an extractor or not. But I think it would benefit you to market your interior cleaning services as 'basic interior cleaning', because word of mouth is both the best advertisement, and the worst. If you get some soccer mom who has never had a car detailed before, you could probably just vacuum it out and make her happy. But what if you get the guy who gets his car detailed frequently, and decides to try you out; and he happens to have a lot of friends with deep pockets who like to get frequent details? Well, he's gonna notice. He isn't going to go back and say "He didn't use a carpet extractor! He wasn't using Menzerna polishes!" No, he's gonna say "The finish looked a little duller than the last guy, and the interior just didn't feel as clean, some of the stains came back after just a couple of days, it just wasn't as good as the other guy".
I absolutely believe that the interior is crucial. What authority does a complete newbie have in saying that? Well, I'm your target audience. I've had cars detailed before. Honestly, didn't even notice what they did to the exterior. Now that I know I kinda feel bad. I just figured they washed it. But looking back, they probably buffed it a little... maybe? No, what I was impressed with was my clean interior. No dust in the vents, no stains on the seats or carpets, dust and crumbs out of all the little nooks and crannies. THAT is what I cared about.
Just my $0.02.