My old toothbrush couldn't clean it, so I had to wash the CPU radiator. Now, all the parts, including the PSU, are clean, but I still have the factory thermal paste 😂. They say old AMD CPUs overheat, but mine (Athlon X4 620) doesn't even go over 70 degrees Celsius, even with thermal paste that's 10 years old. Time to overclock this bad boy 😂