When you rub your feeet and make your fingr spark, that spark is about 70 Volts. That would toast a CPU. You can ground yourself by getting a cheap strap from Radio Shack that straps to your wrist and clips to a bare metal part of the computer. The only vacuum you should use are the special vacuums made for doing electronics that do not hold a static charge. Not a Hoover or Electrolux. No no no. Something like this if you could find a cheap version:
Data-Vac ESD-Safe Pro Data-Vac Professional Cleaning System (DV3ESD1) - Genuine Computer Accessories
When you blow with your mouth moisture always comes out, sometimes, even maybe, a loogie. Not advisable.