The Best Way to Remove Soil

During the course of dust mopping the soil should be
unloaded from the dust mop.  There is no agreement on the
"best way" to do this. You can:
   (1) Brush the soil into a plastic bag with a standard pot brush.
   (2) Vacuum the soil from the dust mop head.
   (3) Shake out, out of doors in an area where the dirt will not
       be tracked back into the building.