It occurs to me that blowing air on something is a good way to build-up the static charge. In the right environment, that will make your dust problem worse. And BTW, I don't have a plate as big as yours but, it's almost impossible to run your hand over it and not feel something.
Anyhow, whenever I use it, I'm not too concerned about minor flecks of dust... It's a fact of life and for the most part, I don't recall measurements ever being wildly off based on the stuff I do...
Ray