I can tell you without a doubt that I am one of the biggest skeptics you'll ever meet and when I saw rinseless car wash in a forum for the first time I thought it had to be total bull.  I am totally anal about my car finish and wouldn't be caught dead with my 13 WRX at an automatic car wash.  There was just no way could I believe that you could wash a dry dirty car without scratching the paint without a proper rinse before and after.  However after reading so many positive reviews and so few negative in blogs and product reviews and watching a couple of you tube videos, I figured it had to be worth trying.  I have an apartment I rent and beach house I own, both with limited access areas and water to wash vehicles, so this would be worth it's weight in gold to me.I tested it out on my g/f's 2009 BMW first, it was filthy with dirt and some traces of salt from driving in the rain.  I used a 2 bucket system, one rinse bucket and one wash bucket with 2 gallons of water to 1 oz of product as instructed.  I used a decent microfiber mitt, and made sure I used light pressure and side to side movements and rinsed out the mitt thoroughly in between small areas once the mitt looked dirty.  I did about 1/6 of the car at a time, drying each section I washed with a Cobra Waffle Towel, which worked wonderfully I might add, and I dried two cars with one towel before the end of the day and only wrung it out a few times.My drying towel stayed pretty clean through the process other than a few small areas due to carelessness on my part.  Also the rise bucket was almost black with filth when I was done the body, and the wash bucket was very clean with only a few particles in it.  Showing that the wash was doing it's job in cleaning and protecting the clear coat.The wheels were a real PITA to be honest, and they took more time than the rest of the car.  BUT, they did turn out really sparkling clean once I got a  system down.  My technique with wheels was to use an old rag to first wipe off any loose residue on the tires and wheel wells.  Next I dipped  a soft wheel brush in solution to soak the wheel, tire and well, rinsing the brush in between each application.  Next I would the use three small towels, to clean. One to clean the outside of the wheels, one for the inside of the wheel and the last for the the tire and wheel wells.  I then used 2 old microfiber towels to dry, one for the outside wheel, and the other to dry the inside wheel, tire and wheel well.  This worked well as it ensured that I never used a dirty towel on the wheels at any point, and using the dirty towel on the tire and well didn't cause any dirt.  If there was any flaw to my strategy, it was getting tiny splashes of soapy water on the body around the wheel areas, which was easily corrected using by wiping it dry with a clean microfiber cloth after I completed each wheel.The BMW finish honestly looked better than it had the day we bought it (used). So I did my 2013 Subaru WRX with it after I gained some confidence, and had excellent results.  Cleaning the wheels and tires is a real pain with this stuff, there's no two ways about it, yet it still only takes about an hour for each vehicle which is about the same time or less than I'd spend doing a normal wash.  The finish is by far among the best I've seen, detail quality shine without using any polish.  I'd highly recommend this to even the biggest skeptic or car detailing fanatic that has limited resources or area's to wash with a rinse.  I'd also recommend it even if you do have access to water because it's better for the environment, more time efficient and just as cost effective as any rinsed product I've tried to date.  It did not scratch my finish, or even get my drying towel dirty.