A sales rep at Office Depot today remarked about my cool iPhone (yeah!) and asked how often I "cleaned" my two items (speaker and mic) on the bottom. I told him never, he bolted, then said I should blow these out with direct, short spurts of compressed air right into the mic and speaker. The compressed air would be from a can -- the kind we buy for cleaning dust from computers, etc. Question: is this a good idea? Wouldn't blowing compressed air somehow hurt the diaphragms in these areas? Any comments on perhaps a better way for get the gunk out of these areas? Thanks.