Off Whte How Do I Get The Cigarette Smoke Build-up Off Of My New Mac G5???

How do I get the cigarette smoke build-up off of my new Mac G5??? - off whte

I am white Mac G5 and smoke while I'm online, outside of my diplay whte rose a yellow ... Who knows how?
Please do not tell me to leave you now, I know it's a bad habit, but that's not what I ask myself :-)