Mopping up Dieselgate?

What does mopping up mean in the following headline? Mopping up Dieselgate: The boss transforming Volkswagen

It take it, mopping up means ‘cleaning up’?

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Yes, although it has a connotation more of “finishing the cleaning” - after the hard work has been done, then you finish by “mopping up”. This is often used in warfare contexts. You win the battle and then “mop up” the remaining resistance. Though as the U.S. found in Vietnam for instance, the “mopping up” is not always a mere formality.

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