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Glass Surface Information
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The International Window Cleaning Association has long been involved with glass issues, specifically surface scratching. Research and education is evolving due to science and the innovation of glass products. Knowledge about glass products old and new enables window cleaners to be proactive and understand the surface we clean and maintain every day. Becoming familiar with this page will allow you to stay current with glass research provided by the Glass Education Committee of the IWCA.

The International Window Cleaning Association (IWCA) and The Glass Association of North America (GANA) released a joint Glass Informational Bulletin (GIB) titled Construction Site Protection and Maintenance of Architectural Glass outlining the need for proper protection of architectural glass throughout the construction process to all general contractors and builders. Please click here to view the bulletin.

Also Found in Technical Bulletins in the Resources Tab (click here) we recommend you become familiar with and have available for reference the bulletins:

IWCA & GANA: Proper Procedures for Cleaning Architectural Glass Products

 Construction Site Protection and Maintenance of Architectural Glass

Systematic Cleaning and Restoration of Architectural Glass


  1. Help educate builders about potential glass quality problems before they become scratches, and the importance of job site protection of glass. Window cleaners can now download documents from the IWCA site to be included in a Builder Education Packet. Send this packet of information to builders in your area along with your proposal or marketing materials.
  2. Study the IWCA's "Talking Points" posted here, to help understand the IWCA's position before attempting to explain potential glass issues to builders and other customers.
  3. Some tempered glass surfaces are highly susceptible to scratching, the IWCA recommends that you study the latest joint release from IWCA and GANA (Glass Association of North America), “Proper Procedures for Cleaning Architectural Glass” and have an open dialogue with your clients about what methods will or may be used to clean their glass, and the potential issues that may arise from deployment of these methods.
  4. The IWCA recommends a glass scratch liability waiver for all window cleaning contracts, before any work is done. Click here for an example of a Cleaner to Builder liability waiver. This waiver is simply an example provided for informational purposes ONLY. The IWCA recommends you have competent legal counsel review any waiver you may choose to deploy in your business.


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