1U Socket 478 Copper Heatsink
This is the heatsink base as I received it from an Ebay seller.
After ArctiClean 1, with ArctiClean 2 applied.
After ArctiClean 2.
Intel Pentium 4 Socket 775 CPU
The CPU was brand new, the original Intel cooler was put on it once, then removed. To clean we used ArctiClean.
After ArctiClean 1.
After ArctiClean 2. The CPU looks exactly like it looked when it came out of the box. The darker parts were already visible on the unused CPU.