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Best way to remove thermal paste?

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Usually thermal paste has hardened if the heatsink and fan system have been on a long time, if it is hardened I usually get a razor blade and carfully carve it off, the hardened material acts as a gap between your new heat sink and the surface heat spreader of your cpu, and if left on, the heat transfer will be inefficient and your system will shut down, I have had it happen before.

If your thermal paste is still gooey, then you do not have to clean it off, once the two surfaces come in contact it will bind the two as it should and heat will transfer from one surface to the other.
 
I did not see it but alcohol based hand sanitizer gel is awesome used with a paper towel.
 
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