Cleaning inside my tower

I am wanting to clean the inside of my tower with compressed air. Is there anything in there that I should not spray? How often should this be done? AND as I am not familiar with the inside of the tower is there anything I should avoid spraying altogether ? Appreciate the answer.

Hi tallin,good tutorial here…….

http://www.computerhope.com/cleaning.htm

Hope this helps…

pacman123

Great help thanks for answering -