The highest level of

The highest level of
cleaning is achieved by
power brushing and air
washing because it does
the best job of removing
the accumulated dirt
and debris in the
ductwork. The
brushing does the best
job of dislodging the
accumulated dirt and
debris because it is
making physical contact
with more of the
interior ductwork than
the other methods. Air
washing after brushing
is necessary to help
move any remaining
Dirt and debris out of
the ductwork to the
vacuum, collection
system.