What is "dust-off"

n. 1 The act of removing dust from something. 2 (context military Vietnam war English) A medical helicopter.

Dust-Off is a brand of dust cleaner (refrigerant-based propellant cleaner, which is not compressed air and incorrectly called "canned air"). The product usually contains difluoroethane; although some use tetrafluoroethane and tetrafluoropropene as a propellant. It is used to blow particles and dust from computer, keyboards, photography equipment and electronics, as well as many every day household items including windows, blinds and collectibles. Dust-Off is manufactured by Falcon Safety Products located in Branchburg, NJ.