Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 130)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Take Apart — Logic Board 130
• Transfer the cosmetic shield, if needed.
• Transfer the battery cable and the left I/O board cable
Warning: Used/existing thermal grease cannot be reused 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, and then to reinstall
new thermal grease—or overheating and damage can result.
Use a black stick to remove the 6. thermal grease from the three mating surfaces.
Use 7. alcohol wipes to completely clean the grease from the surfaces and surrounding area.
Warning: Whenever the logic board is separated from the heatsink, the thermal grease must