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Sorry to say but you've never get rid of those 'torchlight dust' particles - some of them are tiny leftover pits in the surface of the mirror from the making. All mirrors I've seen have them, its a perfectly natural artifact of the mirror. This is why you should never check your mirror by torchlight for dirtiness, the only true way to gauge the dirtiness is in daylight. So put the torch away! You're giving yourself needless worry.
General information in the past was not to used canned air as the aerosol propellant can sometimes spit on the optics if its not used properly, but others have said the latest products are not such a problem. It has been discussed before, I remember joining in the thread at the time, so a search might bring the discussion to light and provide some more info for you as well.
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