I have tried Mr Clean Auto Dry and it works ok, but I have notice some water spots on the car, maybe it is because I have not follow the steps correctly.
I like better a filter system like crspotless because you don't need to use soap all the times, or you can use that system with a high pressure system, also if you wash your car a lot, then the Mr Clean Auto dry will cost you more because the filter costs $5 and the soap another $5 for every 10 times of use.
Read this post about mr clean autodry:
http://www.e90post.com/forums/showthread.php?t=2575