The method of changing thermal paste/thermal pads is the same whether it's on a CPU, graphic card or consoles. Thermal paste doesn't require changing often as these can last for many years, there is more heat build up due to dust/dirt that accumulates in the system than due to the degradation of the paste between heatsink and CPU/GPU.
Thermal paste should be changed anytime you remove the heatsink to make sure heat is transferred efficiently.

I usually replace mine every year partly as I maintain my gaming rig annually or if I'm bored as fvck!

What do yo need?
1. Thermal paste/pads (obviously lol)[ I've used Noctua Nt-H1 paste and Gelid 12mW/K pads]
2. 100% alcohol like Isopropanol (methylated spirit is fine which has 95% alcohol. Avoid nail varnish remover as that can leave residue having only upto 20% alcohol.... no use akpeteshie! your PC fit high!)
3. Cotton buds
4. Kitchen towels
5. Lint free material (cowboystudio?? Don't ask i bought them from China)

Step 1: With kitchen towels remove the excess paste on the CPU/GPU core
Step 2 : As in the case of GPU's, use cotton buds to remove a bit more thermal paste you can't reach with kitchen towels.
Step 3: Wipe of remaining thermal paste with a cotton bud soaked in the cleaning agent, isopropanol in my case.
Step 4: With a lint-free materials remove any deris left over by the cotton buds, kind of a buff and shine.
Step 5: Reapply paste. I ten to use the X pattern, just a preference. Some people like to use a pea-size blob of paste but I find the spread of paste after using the X pattern works for me.
Step 6: Fit heatsink back on CPU/GPU.

I've also renewed the thermal pads on the VRM's. The thermal pads that come with any GPU can be reused if they haven't been damaged when removing the heatsink. Always have some spare available.

Abeg bro is there anywhere to get thermal paste in Lagos?

k

ElMuizzi:
Abeg bro is there anywhere to get thermal paste in Lagos?

I no dey Lagos o bro..sorry for the late reply.

Bro, please where can i get thermal paste in Nigeria. I have an Acer 5739g Nvidia gt 240m cuda but i can't even play winning eleven on it.
Besides the cursor comes out through the other edge.

I have an Xbox one needing this thermal paste
service/replacement. How can you help?