They do interior cleaning at some locations.
We have the ultimate pass (or whatever it's called sorry I can't remember, but the highest one you can get anyway) and to the best of my knowledge after you go through the exterior wash, you can freely use the vacuums but I don't think they offer to do interior cleanings for you. Sorry if this is no help, google asked me if I could offer an answer to this question, so I figured I'd try. Best of luck!
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