JGCASEY wrote:
Durian wrote:

"BruceR" wrote in news:nS5Rd.3502$VD5.2965
:
Yes I don't think you can throw away the old fashion
vacuum. Ours has a vibrator that brings sandy particles
to the surface for removal. We need a robot that can
use vacuum cleaners the way we do for those monthly
cleans

Or at least a robot one with a rotating brush or some other kind of
vibrator. Like you say, that brings the dirt to surface.