Any general cleaning up process should apply, and you can go from very thorough cleaning, which would be more recommended to be sure, or you could go to some more quick attempt, which might be enough but might also not be enough, hard to say because we dont know how this specific grease will behave.
A thorough cleaning up process would be redissolving in vinegar, doing a couple of defats with solvent, basing, pulling, washing with sodium carb, freezing (and maybe re-xing). A quick clean up would be simply attempting a re-x.... In the end its up to you to choose what is worth, depending on amount of DMT you have, on how bad you consider this grease to be, etc.
Let us know how it turned out.