The sensor or lens surface so new particles are not again immediately attracted to it. A mere artist brush cannot clean all of the dust, nor can it prevent dust accumulation, even immediately after its use. To draw a parallel, the sensor surface is much like the face of a computer monitor. The dust is very hard to wipe off with a dry cloth. The result of trying is better described as “dust rearrangement” rather than “dust removal”. Use BRUSHOFF prove it to yourself - a conductive brush can, if it is grounded, brush the dirt cleanly off the computer screen just as it will off your sensor. No longer attracted, the dust easily falls off.