Hi Ivan -

I think you'll find the brush trick to be a real pain, and not a solution to
your problem, especially after it has snagged a few boards and popped them out
of the conveyor onto the floor or into the bowels of the wavesolder machine.

Recommend you concentrate on isolating and correcting the origin of the
micro-solder balls.  I assume you've done all of the normal checks of your
preheat and solder profiles, along with flux chemistry and density.   As a
hint, if your boards have dry film mask, check the compatibility of the mask
and flux very carefully.  The flux manufacturer can probably be of
considerable assistance in this area.

Regards - Kelly

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