Originally Posted by DanishDevil

It's just copper. Take a thin paper clip and unroll it and use that between all the pins to scrape the crap off.

And quit using crummy coolant

And yeah the Fuzions are pretty cool, huh? If you think they work cool, the EK Supremes are even more complicated.

BTW: If you ever tarnish the copper on the bottom of a block or heatsink (from fingerprints and whatnot) take lemon juice, and a few small sprinkles of salt, and just rub it with your finger. The acidity of the lemon combined with the slight corrosiveness of the salt takes it right off. Then rinse with water and pat it dry. Gotta give the props to fit, though