I use the Nitrogen tank as PE suggests, and couldn't be happier.You can buy an empty tank for Nitrogen for about $200 or less and have it filled for about $30. The reducing valve for the top is about $120. One 4 ft tank will last you just about a lifetime!
PE
What about Dust-Off or one of the other brands of dust-removal spray? They are supposedly inert. I use this for the very purpose you describe, and have not yet discerned any problems from it.
Argon is way overkill due to expense and rarity compared to Nitrogen.
I don't think it is as simple as that. At least if you don't want to have a large tank in house.
Over here there do not exist 1L N2 bottles. Thus one would have to buy a 1L CO2 tank, repaint it etc., have a valve adapter machined to comply to the NO2 system and, most difficult, have to find a company willing to flush and fill that non-standard tank.
Anyway, independant of any bottle size, for an amateur user the tank and and valves would probably mean the greater share than the gas itself.
Forming gas has been adviced somewhere else. But this is not even flammable, as Propane/Butane, but stated as highly explosive, even to be ignited by strong oxidants.
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