What he said. Compressed air.
And I have THIS KIT: http://www.bhphotovideo.com/c/product/485946-REG/General_Brand_59199_Mini_Vacuum_Attachments_for.html
It hooks up to your standard vacuum cleaner (if it has an attachments hose) and lets you get into all those nooks and crannys. Good for keyboards, car vents, down between the seats in your car, etc.