Power off the device

Unplug all cables and power sources

Remove the heatsink or cooler

Wipe off excess thermal compound with a dry lint-free cloth or paper towel

Apply isopropyl alcohol to a lint-free cloth, cotton swab, or coffee filter

Gently clean the remaining compound from the CPU, GPU, and heatsink surfaces

Repeat with fresh alcohol and clean swabs until the surfaces are clean

Let all surfaces dry completely

Inspect for leftover residue and clean again if needed

Avoid using metal tools or abrasive materials

Reapply fresh thermal compound before reinstalling the cooler