Glass washing shall be done with clean water and necessary equipment to remove all dirt, grease or stains and shall be left dry. The use of ammonia or other cleaning agents is allowed in solution with the water, but only such materials will be allowed that are not injurious to painted, varnished or building surfaces. All work shall be done in a competent manner. Premises in the vicinity of the work shall be left clean. The Contractor is to clean excess cleaning solution off window ledge and sills. When washing has begun on a building, the Contractor shall finish all glass in the building with no absences from the job unless due to weather. All exterior aluminum surrounding windows and structural glass in curtain walls shall be cleaned with an approved solution, necessary to remove all dirt, grease or stains, which is not injurious to the finish.
