Identify the glass and site
Provide the building location, window type if known, visible issue and any available glass or facade-care instructions. Ask the building manager or owner whether site-specific access or work requirements apply.
Verify the proposed product with the right source
Ask which product is proposed, what surface it is intended for and whether the glass, coating or frame maker permits its use. Check the product label and relevant maker directions; this article does not recommend dish soap, acid, alcohol or another solution.
Confirm qualified access and work scope
Ask the provider to explain the proposed access arrangement, site assessment, personnel qualifications, safety controls, exclusions and contingency plan. Do not use a pressure washer, pole or other equipment at height based on generic internet instructions.
Review the written proposal
Confirm which windows and surfaces are covered, access limitations, product handling, price basis, scheduling and how the provider reports damaged glass or unexpected conditions. A standard window-cleaning service page does not by itself confirm high-rise capability.
