Wow that's pretty bad. I don't THINK my block is anywhere near that; I can see copper still and not white/greenish oxidized crap if I look down into the barb. I put some diluted CLR in it this am and will see if that clears the crap out of the block. I would assume that CLR has lots of organic ligands to chelate cations (Ca and Fe for lime and rust) and is acidic t dissolve them in the first place. Seems like it should work on the block too. Too bad I can't really open it up and see what's insidde. You think if I got the block cold enough that it would separate? Minus 80C is about the best I can do in my lab at the moment, but I could probably borrow some liquid N2 from someone at work.
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