Thermal Paste Maintenance

Hello,

I've recently cleaned all of the dust out of my 2009 Mac Pro with Isopropanol 99.9% and wanted to clean inside of the heatsinks too as I can see a lot of dust inside. I understand that when I take the heatsink off it will seperate the thermal paste from the processor, so will have to be reapplied. I have ArtiClean Thermal Material Remover, Thermal Surface Purifier and Arctic MX-4.

The machine is three years old and out of warranty, I was going to sell it but the low resale price has made it worth keeping so wanted to do some preventative maintenance. Other than the fact I would have to reapply the thermal paste when I take the heatsinks off, would you recommend reapplying it routinely anyway?

Thanks

Thanks for the response Daniel.

The rest of it was pretty bad, it took me two days to clean. I use it mostly for 3D and will leave it rendering overnight quite a lot of the time, so it can be going full speed between 24 - 72 hours.

I wanted to do this firstly to clean all the dust out of the heatsinks and cpu fans, but also
check what state the current thermal paste is in, I don't have much faith in Apple's mass production attention to detail. I figure as long as I do it properly, I can't do it any harm and maybe improve it's thermal performance, as well as preventing any future damage from dust esd.

I have a couple of related questions to this post, so thought I'd resurrect it rather than start a new one.

I've been researching exactly what I need to do to replace the thermal paste and read in the Mac Pro technicians manual that on a 8 core Mac Pro the processors are lid less and aren't held in place by a clamp. Consequently when I remove the heatsink the processor could be stuck to it with the thermal paste.

Does anyone have any advice on what would be the best way to clean the current thermal paste off the processor? Should I reseat it first? My only concern with this is that it isn't clamped in place and could move around while I'm cleaning it causing some damage to the sockets, or should I find a way of cleaning it separately? I suppose I'd have to find some way of suspending it, I presume placing it on a flat surface would cause damage to the underside. From what I've seen, it can take some effort to clean off old thermal paste.

Any advice?
Thanks.