I am so stealing Duckie's thread, but since he doesn't post on here, it's okay

Here is what he posted on overclock and I thought this was valuable for the people to see..

Both blocks have been throughly cleaned. They have been soaked in vineager, toothpasted brushed, and acetone cleaned multiple times. One waterblock was used for a few years in a copper only loop. The other block was used with aluminum for a few years.

Left with aluminum, the other only copper.







http://www.overclock.net/water-cooli...waterloop.html