Now we know that the ArctiClean makes short work of the stock paste found on Intel HSFs, but how does it stack up against a more difficult foe?

This is a stock Intel 478 pin HSF that about a year ago I cleaned off the stock thermal paste (with a knife, a rag, and isopropyl alcohol) and applied Arctic Silver 5.  It was installed for several months so the grease is baked in good.  After it was removed it was floating around my spare parts bin for several more months.  As you can see, I've had my fingers all over it so there is all sorts of discoloration and fun stuff on this heatsink.  A few drops of the magic liquid...

30 seconds...

One paper towel later...

Amazing.  It looks like it just came off a CNC machine.