I like this idea. The holder snaps onto you dust mop or mop handle. They say it has a stainless steal blade and that it is thicker and stronger than the normal razor blade scrapers. States it has a chisel edge. The holder has new blade storage. It fits 7/8 to 1" handles.
Cost in this catalog was $7.30. Its titled the Scrapemate Scraper.

Boy it would be neat if this was a janitor that pattened this device. If you think of it go for it. It looks like its hot for new and functional in the industry.

http://www.jansup.com/servlet/Detail?no=28931