Never had a problem for over a decade now using the same bristle end on my shop vac. The cleaning kit it came with has adapters to go to smaller bristle ended cleansing brushes which helps to actually get inside rads and around VRM circuitry. Actually about to clean a 7970 with the setup and try to fix the issue my friend described.
Edit: Cleaning smoker dust off a 7970 right now. Yuck
"Resolution is just a number." #Ubisoft Origin/Steam
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