Nicely done. I used the DWC on my dad's newly purchased, used 2000 Corvette, and it worked wonders. I use the GWC for my regularly-washed cars and sometimes even just the shampoo (my wife's mini-cooper seems happy with that). Perfect assessment that Deep Wheel Cleaner is not the routine "go to" product. It fits an excellent niche.
As a minor quibble, I'm not sure I would list it as a "CON" that it strips protection. I think that is what it *should* do, much like putting APC in your bucket wash to prep for a full correction.
Thanks for taking the time and effort to write this up.