Take another cotton ball, dab it with isopropyl alcohol, and gently wipe the thermal paste off of the GPU and CPU.

There is no need to rub hard as it should come off with ease.

Once the thermal paste is completely off, let the heat sink dry for a couple of minutes.

Apply a dab of new thermal paste in the middle of the CPU and GPU.

Corsair TM30 thermal paste is used in this guide.