Dust cleaning of scope, etc

[Raymond Locke]

Can I use Office Depot "Cleaning Duster" to blow off dust from my scope? "removes dust and debris from electronic equipment"  But contains difloroumethane?

[Sean McDonald]

Hi Ray,
 Don’t use that spray air, optical glass will be hazed by the propellant.  There’s a lot of good cleaning info on YouTube, basically blow off the big chunks with a bulb squeeze blower to get the big stuff off, then drag a dry cotton ball with no pressure across the glass to get the medium stuff off, then utilize lint-free cotton wipes lightly dipped in 99% pure alcohol to get the tiniest stuff off, never use the cotton ball for more than one wipe across the glass, go through a lot of cotton balls yes  sometimes I finish with distilled water on cotton ball.  Pita yes, but you cannot unscratch your optics

[Raymond Locke]

thanks for the tips.  will do