See the little link under your post that says "Last edited by Skurai;"? Click it and, Wikipedia styley, it shows you a comparison between the original post and the edit.

Captain America indeed!

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The only way to make entirely sure that it's free of contaminants is to not only assemble the rig in a clean room, but manufacture the components in the clean room. Even then, I doubt it would work.

Theoretically, maybe. Practically, however, you can never get it clean enough to run indefinitely.