Its been around for a while really, mainly been a detialiers secret in the USA a few years back, but i've been using them since 2000 at least, now most compaines selling them, meguiars clay bar and quick detailer is one of the best priced for under £15.
Clean your car and then use it, your be shocked at the amount of dirt left on it, i'd recomend breaking just a small section off the bar (thumb sized), rather than using the whole thing, that way you can reduce the contamination to the bar and start with a nice new peace for every other panel, etc
Andy
Andy,
So does the product "Meguiar's quik clay detailing system" come with the bar and the detailer spray then?
reading your post above, you wash.... then clay bar, then polish/wax??