The other day I got a "demo" by someone trying to sell this product:
http://www.fw1.com.au/page/products.html

It's basically a foamy type spray, that he let sit for 30 seconds and wiped off the car with a piece of material similar to a chamois.
The end result was pretty amazing, it was clean, I could see my reflection, and no sign of it scratching the paint.

He did it on the windscreen, and it was also the same result, it was clean, and my finger prints wouldnt show up when I wiped it.

He did the same to my rim, and brake dust wouldn't stick to that part of the rim.

All in all it seemed pretty good, but I'm not sure if its bad for the long term?

Anyone used this stuff before that can give some advice/feedback?