In article ,
Adam Funk writes:
-- Another researcher, comparing bacterial residue on hands
-- after drying with the warm air device, paper towels or a
-- continuous cotton towel, found that the towels were
-- significantly better in removing micro-organisms. While the
-- electric devices increased bacteria on the hands by 162
-- percent, paper towels decreased bacteria levels by 29
-- percent.

Your hands can, presumably, never be cleaner than the water with which you
rinse them.
--
SAm.