Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 129)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Take Apart — Logic Board 129
Warning: 3. If the logic board was removed to facilitate another procedure and will
be reinstalled, the existing thermal grease cannot be left on the board and must be
completely cleaned off, since it will create a thermal barrier if combined with new grease.
Use the following procedures to clean off the old thermal grease—or overheating and
damage can result.
U 4. se a black stick to remove the grease from the mating surfaces of the three chips.
Important: Use extreme care not to damage the chips or logic board components.
Use alcohol wipes to completely clean the grease from the surfaces and surrounding area. 5.
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Install EMI gaskets and tape on the ports from the gasket kit.