Originally Posted by johnL
The mr.clean system does not work well at all. You might want to try a product called CRspotless. I've been using it for a few months now and it works amazing. I use it on the final rinse and let it air dry. Not a single water spot. It's a little on the pricey side, but I'd recommend it for anyone who is meticulous about keeping their cars waterspot free.
I can second that - I have bought the CRSpotless and have not been using any towels since than