Ha ! Mine are !!! But then I have a pretty good sized extractor and big wand tool for the inside.. And I have lots of floor air mover fans to help dry it quickly so I can then follow up with a good vacuum again..
Its of course, not ever going to be as powerful as those huge truck/van mounts, but if you really, I mean REALLY Vacuum incredibly well, brushing in all directions while doing it, manage how much and what kind of soap you use, scrub in, steam it, and then really extract the heck out of it, yeah, there is really nothing better..
For all the vehicles I have ever done, I have yet to find anything that could work best than Meguiars APC+, because it cleaned really well, was very low foaming, so less mess to pull out, and left a great clean scent, because it was clean !
This stuff is so good I used it always with a little steam through a towel to clean nasty dirty sun visors and headliners.. It really worked great on headliners that were coated with nicotine too..
Dan F