Cleaning the microprosessor on the logic board

hey guys,
I have an eMac 2002... I am trying to clean the heat sink and the microprocessor on my logic board so that I can apply new thermal paste. I heard to use 90% alcohol, anyone who tried it?
Another thing, I know this is for iMac and Mac minis but maybe some of you had an eMac before... There is a film on the microprocessor covering the whole square like a thin clear plastic one, does that come off before the new thermal paste or not?
And also my optical drive carrier again from the older eMac like all has a metal heat shield. The service manual calls for a cotter pin to hold it in place. I do not remember having a cotter pin there when I was disassembling it. However there is this plastic pin I found on the floor that may have popped without me noticing while I was taking it off. It looks like a screw but plastic without the threads instead a pop in type of kind. Any clues? Can this be the pin?

That film thing was on there... This is the first time I opened it and was kinda puzzled with it... It is like some small square plastic with a smaller square in the middle. I peeled it already being so curious. I think it was a unique thermal pad with the paste already on it like double sticky tape... Sides were covered with what looked like silver thermal paste and the inner square with a black looking paste... I know sounds crazy, but that is what is on my microprocessor...

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I hate to break this to you, but life isn't fair. If your job is that critically in need of a computer, then you should have a spare to use for just this kind of situation or have your employer provide you with a computer to use.
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Hi
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devalias
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Mj
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https://plus.google.com/photos/118184697040837060146/albums/5873105616394112433
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Cleaning the microprosessor on the logic board

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