Well said, Ken!  Clean does not mean "new" and some perceived aging is
appropriate to an older building.

Ilene

"A good masonry cleaning job: Barnes & Noble Bookstore at Union Square,
both
north and south elevations (disclosure -- we did it). Won several
awards.  If
you look at the B &N you will notice areas that look dirty. A "good "
cleaning job stops before damage is done, and therefore the building may
not
appear to be really clean clean. The common perception of "clean" is
immaculate in appearance, this is a rare achievement and to best effect
if
you start with an already clean building. Dealing with expectations as
to,
"What is clean?" is, for me, the most difficult part of a cleaning
project.
Before you can settle on good/bad cleaning jobs you have to define
clean. A
good cleaning job is one that reveals hidden problems, pleases the
customer,
and does not damage the masonry. ..."