RhinoFart

Any 2 different metals in a medium of water, in the vicinity of EM currents will have "cross contamination" eventually. When you wiped it off, did it all come off, or leave a bit of a "stain" behind?

I have a PETG system up and running for over a year now. 0 leaks, 0 issues with it at all. I have UV lights in my rig, and my white tubes are exactly the same as when I first installed them. My machine is on pretty much 24/7 as well.

Well, there are some extremely beautiful rigs on this site. So, here is my WIP so far. Lian-Li PC 60 Case Asus Rampage Extreme III Motherboard Intel 980x Extreme Edition 3.33Ghz OCed to 4.25Ghz with Swiftech Apoge XT Waterblock XFX R9 290x with GPU Heatkiller 3 and matching Backplane. 2 x Samsung EVO 850 1TB SSDs in RAID 0 (Yes Striped) LG Bluray Drive 24 GB GSkill RAM DDR3 Top Rad AuquaComputer Airplex Modularity 140 with Built in D5 Pump & Additional Reservoir-Copper Edition Bottom Rad AquaComputer Airplex Modularity 360 3x120MM-Copper Edition All tubing is PETG Hardline Tubing. Power Supply: Corsair 750w Fully Modular so I could do all my cable sleeving myself OpenBuilds OX CNC machine that I built to help me with some of my more fancy stuff. Next build I do will be a much larger more "modern" case that will allow me the space I need. For this one, I had to cram everything into a standard Mid-Tower ATX case. I absolutely love my Lian-Li case.

Galvanic Corrosion. Are all your heatsinks, and RAD using the same material inside? If you mix the metals (copper and tin for instance) you can get that kind of issue. I had almost the exact same thing happen to me back in 2002 when I first started with Watercooling.