I just used it for the 2nd time on my car, and I still was nervous. Some slight road salt and road spray were the culprits....and it came out just fine. I was only under garage lights, so I'm waiting to see the car under direct sun, but there was no obvious marring.
I used a sheepskin for the wash and two ww micros to dry, one for the first pass and one to finish. I'm amazed at how well this stuff works.
I did the rims last with the remaining solution and my cheap micros that I use for wheels and door jambs.
I used 2 buckets of solution. I made the main wash solution at the recommended strength, but used a second bucket at half strength to do an initial rinse of the dirty wash mitt or micro, then soaked it in the main wash bucket. It seemed to work well, the rinse bucket was filthy, but the wash bucket was relatively clear.