The way I think clay-barring works...
The goal is really to lubricate the surface so it just glides over the smooth areas without really touching the paint, no contact, no scratches. That's what the spray that comes with it is for.
When it runs into a cunck stuck or imbedded in the paint, the contamination will put a scratch on the surface of the clay bar. This action causes the clay to grab and abraid the contamination in a very localized fashion thus removing it from the surface without damaging the surrounding paint. It's really just leveling the area to the point where the clay bar starts gliding over it without contact.
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