Two aspects about touchless car washes:
1) They do not remove de-icing road binders (AKA beet juice) and that requires a physical/mechanical removal of that road traffic film (RTF). This is a reason many Autopians will do a rinse-less wash AT HOME after going though a touchless car wash. It also allows them to clean out the door jams and rear hatch/trunk jam that touchless car washes do not get to.
For myself, I bring my microfiber drying towels (Griot`s Garage PFM 16 x 16 inch, because they are smaller and easier to handle) and wipe off my car at the car wash to really dry it and get at the door jams. Yes, my towels get dirty. Yes, I induce scratches/swirls in the paint (I`ll deal with that in warmer spring weather). My reasons for doing so is this:
a) Don`t have a heated garage to do a rinseless wash.
b) Ambient outside temps are usually 20°F or colder, so water freezes rather quickly, and it is just easier to remove the excess water at the car wash.
c) Removing the water in the jams prevents having a door or hatch/truck lid from freezing shut. (Yes, it does happen rather fast in below 0°F temps. And, yes, it is WHY many cold-weather Autopians wax/seal/coat the jams and use protectant on the seals).
2) Does your car wash use recycled water? If you live in the desert southwest or southern California and you have water restrictions in your area, it may require car washes to use recycled water to save on using water. MOST car washes do not, but if you are washing with just filtered recycled water, that water may not be totally clean of car wash chemicals or environmental RTFs. Then again, you probably are not dealing with de-cing road salt in those areas anyway!
As far as tunnel car wash chemical manufacturers, there are a plethora of them, just like detailing car-care chemical manufacturers. Some of them are familiar, like Chemical Guys. There is a reason they sell these chemicals in 55 gallon drums.
My area (Green Bay/De Pere WI) has two car wash chemical manufacturers: R Lewis Technologies (a spin-off from PDQ car wash) and Blue Dolphin.
Which of these many manufacturers has "better" chemicals? That`s the question for this topic.
I would definitely ask a tunnel car wash who makes their chemicals that they use. MOST tunnel washes have the name that chemical manufacturer prominently displayed in their signage, as this is a selling/advertising point for using their car wash (We proudly use "Brand-X" for a better wash!)
As a side note: if anyone sees the Simonize name at the car washes in their area, let me know. It`s more a question of curiosity.