guitarfreakyman wrote:
use a knife

Are you insane? Great way to accidentally scratch your finish. Oh....you were joking, ok.
Best way to remove dust from a guitar under the strings, from the headstock, and inside the p/u cavities, is to go to your local hardware store and pick up a fine, soft-bristle paint brush (typically around $10-$20). If there are metal shavings stuck to your pick-up poles, you might be able to get them off with compressed air.
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P.S. - Calli is an A-hole. But I can't help but love her.