The art and science of window washing

by Bill Lackner, Tour Guide at Lanier Mansion State Historic Site, and Anne Fairchild, Eastern Region Program Manager

When it comes time to cleaning windows at the Lanier Mansion, there are extra things to consider. After all, some of the glass dates back to 1844!

First, there is the old method of using  gravity as the main method to flatten the surface of blown glass.  Because this system wasn’t perfect, the imperfections and distortions you see can make weak areas in the glass.  Also, this method did not allow them to make large panes, so we have many tiny windows supported by wooden frames instead of one large window. This makes the job even harder! 

Then there is the new technology to consider: A thin film filter was applied to the interior surface of the glass to block ultraviolet light. This filter protects textiles, papers and other surfaces from damaging sunlight coming through the windows. Any abrasions to this delicate film can cause damage from the sun in the future.

Then there is the outside. These windows are large and very high up in the air! They are pretty hard to get to and you need to take great care to prevent damage to the old window panes, the window frames and blinds (today we call them shutters). So, where do you put the ladder? It gets tricky.

Of course the biggest hazard is falling off the ladder. Any volunteers?

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