I don't use the unit he is using. Kevin is well respected and even helped BMW USA develop their training programs.
I don't recall showing any disrespect for Kevin.

It did appear that he was using the unit as a pre-rinse and actually did his wash with a spray on, wipe off product similar to Poorboy's Spray & Wipe.
Several of the other videos, (Not Kevin's), used methods I don't think I would use. Lots of rubbing and wiping with dirty towels using just the "steam" vapor for lubrication for instance.

Like I keep saying, use it if you like it, it's just not for me.
Anyway:
This subject deals with a lot of information that most of us aren't familiar with and I for one have a tough time digesting it all.
Maybe my definition of steam is what confuses me about the car steam cleaning thing.
I thought water had to be 212 degrees, (at sea level) to become steam, but that isn't necessarily so.
Flash Steam can be formed at much lower temperatures by quickly reducing the pressure on heated water.
Maybe that's what is happening with these systems.
The actual "vapor" temperature may very well be less than some hot water heaters.
I still think it deserves a separate thread and my part in hi-jacking this one is done.
I probably won't participate in another one, but I will probably follow it to some extent.
My curiosity is just not enough for me to care that much about it.
Maybe someday, but for now, my "Winter Washing" will be confined to the DIY places, waterless and rinseless washes.