Does a clay bar really work?

Clay bars work wonders on cars that have been neglected over the years, and ones that are not routinely detailed. I prefer using a Clay Magic system, and it comes with the bar, a booklet, and the lube. When youre done washing your car, you spray the lube on, and then rub the bar over the wet area, and it takes off the top coat of clear coat, and wax and removes all the contaminants that are stuck in the paint that washing cannot and will not get out. Once your finished claying, wash your car once more to get all the excess clay off!

I briefly covered the "how" a clay bar works in the post above this one. But the condensed version is that it pulls the contaminants out of the clearcoat in which they are stuck in.