I was under the impression from a couple other posts that the aluminum leaves the waterblock in the form of AL3 salts which you will find in the system (it's corroded rather than plated).
I was corrected in originally believing this was galvanic corrosion, but if I can remember a couple people I think called it a redux reaction due to the battery affect again.
This probably doesn't help much, but I hope glycol takes care of it.
Overclock-Watercool had a recipe for mixed metal systems of:
120oz Distilled Water
6 oz Glycol Antifreeze
2 oz Water Wetter
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