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For me, a can of compressed air helps rid the heatsink fins of loose dust, for the more stubborn dust entrenched on the edge of the fins, a toothbrush or paintbrush help. I usually clean the contact surface with lighter fluid. I live in the the tropics, so the alu fins would be oxidized, so I woukd dipped the entire heatsink into a small pail or bucket of Coke....Coca Cola that is. Leave it for an hour or so, remove and the surface of the fins looked pretty good. For safety sake, I would shake it dry, wipe contact surface of the heatsink and leave it to air dry for a few hours. After that, reapply thermal goop and remount.
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