The laser techs here have all learned not to hold the can too close to the optic they're cleaning.
It can't just be that the optics are getting dislodged because of the pressure if they spray too close?
Canned air has a propellant in the can as well. It isn't just air. If you spray it too close then the propellant ends up collecting on the item because it can't evaporate fast enough.
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