I cleaned out my D-tek TC-4 rev 2 block the other week and other than the anodized layer coming off the alum top, there was almost no corrosion at all! I've had it running for almost 2 years now. It's been quite a journey, and a great investment having been used in an amd system and now an intel system so it's seen alot of action. Anyways couldn't have done it without the help I found here and the stickies.