What is a recommended procedure to follow when cleaning computer components?

What is a recommended procedure to follow when cleaning computer components?

• Remove the CPU before cleaning.
• Blow compressed air on cooling fans so that they will spin when dust is being removed.
• Use window cleaner on LCD screens.
• Hold cans of compressed air upright while spraying.
  

  Explanation: When using compressed air, keep the can upright to prevent the fluid from leaking onto computer components.