I'm changing to a new heatsink, and I heard it was a good idea to clean the heatsink compound from the previous heatsink before installing the new one. I don't have any thermal grease, so the chip looks pretty clean already, except for the compound stuck around the core. How would I go about cleaning this off? I've pressed it with my fingernail and it seems pretty stiff to me, I have no clue as to how to wipe this off. Help me! 🙂