[identity profile] monsterbrain.livejournal.com 2008-08-19 08:57 pm (UTC)(link)
It's for cleaning the projection lens in your early 20th century continuously-running 5-cent theater (http://en.wikipedia.org/wiki/Nickelodeon_movie_theater).

[identity profile] christopher575.livejournal.com 2008-08-19 08:58 pm (UTC)(link)
Weird, I figured you'd have to use lye or something. :)

[identity profile] monsterbrain.livejournal.com 2008-08-19 09:09 pm (UTC)(link)
The old-fashioned method was lye, borax, saltpeter, malt vinegar and saspirilla, mixed into a paste and rubbed over the lens with a pad made from the soft beard of an elderly Polish woman.

But with the invention of Nickelodeon Lens Cleaner, just spritz and then wipe with an ordinary Jew beard!