Waterless Car wash products

As anyone tried these type of products? What results did you have?
They seem dodgy to me, how can you just spray something on your paintwork and wipe it off without scratching it?

If its lightly dirty ie no dried on dirt etc then a waterless wash - which is essentially detailing spray will do limited damage and give you a quick / great result.

However if there is baked on dirt etc i would never even dream of it.

Basically waterless should be used to "top up" an already clean car if that makes sense?

Thanks Mario, good point about not using it if the car has caked on dirt.
Has anyone used Waterless bodywork washing over a long period, and if so, noticed any problems.....

I've been trailing various products
ONR is superb and when used with a GOOD microfibre pile does a great job at 8/1 ratio
I find even a few splashes with a normal wash (Using wash mitts) really brings the car up well ... ONR gets my vote, but dwell time is key and car can't be caked in crap.
Also tried No2h20 - it's just a detailing spray at best..over priced Tat .
Tango by Autosmart is a nice bridge between light waterless wash and good detailing spray.
I use Pink Stuff for the wheels which is non acidic..it's great think it's called Berry Cherry or something
I'm no professional and the thread on here for coupe detailing is,awesome..but as it's written by pros..I assume They'd pahpah waterless or no rinse products