Hmmm. The only real "de-programming" that I know of is done to people with Stockholm Syndrome or who have joined cults. But I don't think that's what you want, because the point of that is that the people themselves consciously believe their programming, and you're trying to get them to consciously reject it.

That's pretty much the reverse of the situation with Hawkeye. (I assume, based on canon.) Or is it? What sort of residual effects were you thinking he'd have? I could probably figure out something based on that.