Often customers will call with special needs such as efflorescence removal.  Efflorescence is caused by water intrusion into the masonry system.  This is sometimes used if the masonry system is not properly flashed.  The moisture will exit the structure via mortar joints or other openings in the building.  While cleaning this will remove evidence of efflorescence it will not solve the problem.  In some cases a sealant provides relief while in other cases sealing openings, re-caulking failed joints or installing proper flashing is the permanent solution.