What is a proper directive for using a can of compressed air to clean a pc?

To properly clean a pc using a can of compressed air, one should follow this protocol:

1.) Use the compressed air to clean any exposed fans on the PC unit.

2.) Carefully remove the keys from the keyboard, and spray the compressed air on the keyboard to remove any dirt and debris.

3.) Spray the compressed air in any tight corners and cracks on the PC unit, in areas that would be hard to reach with a normal cleaning cloth.