A professional who cleans windows, glass partitions, mirrors, and other glass surfaces of building interior or exterior, using pail of soapy water or other cleaner, sponge, and squeegee.

• Crawls through window from inside and hooks safety belt to brackets for support, sets and climbs ladder to reach second or third story, or uses bosun's chair, swing stage, or other scaffolding lowered from roof to reach outside windows, or stands to reach first floor or inside windows.