After using and also owning more shampoos than I know what to do with, I have come to a few conclusions.
1. When using a wash media: I haven't noticed a difference in cleaning ability. After all, the pad/mitt is doing the work. (this does not include snow foams or like practices)
2. A lot of shampoos can't be differentiated by lubrication. Some clearly lack though.
3. IronX Snow Foam is a waste of money. Does rinse away nicely though.
4. Adam's old formula Car Shampoo is underrated and their new formula is supposed to be better. I'll see when it gets warmer out.
5. AMMO, Lusso, Victoria, GTechiq, Optimum, Auto Finesse and Adam's are all top notch (actually a lot of shampoos can be in this list). They all mostly act the same and they all rinse away easily-- even at higher than recommend dilutions.
6. Hyper Wash or Optimum would probably be what I used if I was trying to make money.
7. Most of Chemical Guys' shampoos leave a lot of residue behind. Wonder Wash is nice though.
8. PBMG shampoos are good too. So is Gyeon and Garry Dean.
9. I'll get heat for this, but I think CarPro Reset is a tad overrated. Yes it works well, but it's not this new (2014) shampoo that cleans well and also rinses away easily. It does what it's described to do and would recommend it to anyone, but a lot of shampoos do the same thing. It is nice not to interfere with a coating's water behavior though.
10. I've noticed some shampoos that leave residue behind also don't play well with multiple 'drying aides'--if you use one.
11. Aero Suds is terrible.
12. I don't like HD Wash, but Pink Car Soap is nice.
13. Stay Fresh Shampoo Bath is nice, but their reps are so annoying on other forums.
14. Prima Hydro Wash irritates my hands, but works well.
15. I'm sure I'm missing other points and I know I've left out 50+ shampoos but I'd have to look at my notes to remember them all.
Also, most of this is subjective. So keep in mind---> IMO.
