Right so i took my car to get sprayed a week or so ago and i can see some small bits of paint where he must not of wiped it when wet etc, and not its stuck on my car dry.

People are saying for me to clay it off. So I've bought the G3 clay mitt from halfords. 

But i was just wondering, if it will take the black excess paint off, how come it wont take off any other paint from the car?