Cleaning this would be easy if the thief knew what he was doing.
Break the sum into several thousand random size wallets and simaltaneously start a massive hoping trail across various alts and exchanges via a few herds. I would love to see these "heroes" track tens of thousands of smaller wallets converted between dozens of alts, re assembled and mixed again. Estimated loss is 20% of the haul but $180 Million cleaned still isn't too bad.
~BCX~
Wouldnt even take that much or than many wallets. Loss of ~1%, and 24 hours. Simple.