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Hi,
There are actually several grades of clay used by professionals ranging from aggressive to mild. The clay you can buy as a Consumer is actually a sort of 4th grade somewhere (depending upon who manufactured it - there are only 3 actual manufacturers of automotive clays, everyone buys from them and re-labels it) between medium and mild.
Removing paint overspray is one of the primary uses of claying a car by pros, it was first adopted for this purpose. That said, the key to doing a proper job is to use fresh, clean clay and to lubricate it liberally with a solution of soapy water or water mixed with Glycerin (available at any Drug Store). Turn the clay often and keep spraying the lubricant (til it's running down the paint). Don't press too hard, let the clay do the work, several light passes are better than a few hard ones.
It will remove any sealant or finish, so be prepared to re-zaino the surface when you're done. Hope this helps...
Happy Motoring!... Jim'99
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