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A compressor works very well for cleaning dust off a mirror or corrector plate. Just be gentle, do not blast it but use light pressure (air velocity) at first and gradually increase the pressure, taking your time. And don't go nuts over stubborn stains or bits of dust: they will need a wash to move safely.
I've not used a can based blower on optics (only on electronics) but IME it's harder to control than a compressed air gun and the air/gas stream is more focussed (so more chance of doing damage by blowing an abrasive particle across the surface). But you can control it using distance from the surface instead of the trigger like a CA gun. (But in either case also use distance from surface to control how soft or hard..)
I use a bulb blower regularly on eyepieces and mirrors. They are typically gentle enough but not powerful enough to remove as much dust as a compressed air gun might from mirrors.
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