I'm still confused why you seem to be having such a tough time cleaning these particular chips. THREE separate threads worth too. I've hand cleaned all my used chips from TCR sales with nothing more than a dish brush, some Dawn dish soap and a Magic Eraser or Scotch Brite pad with zero problems beyond utter boredom or maybe a hand cramp.
I guess I'm surprised that you haven't posted a picture of the chips in question, particularly so we can see just how dirty these are. I can't imagine they need as much agonizing over as you seem to be giving them.