Robert Lazar:
Thanks for the advice, but how does one know which ones do not contain
propellants?

I think that they all do, but it doesn't matter as long as you follow
directions and hold the can upright. I've been using this stuff for
years on my Questar and various cameras with no ill effects. I would
also recommend not holding the can too close to the glass surface;
anything that you can't blow away with a gentler blast is probably
going to have to be removed in some other way.

I also think that Mr. Mollise's advice is important -- don't use canned
air on a first-surface mirror.

Davoud

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