To dream of mopping up a floor or mess may reflect feelings about a lot of work being needed to perfectly clean up a problem. Laboriously making a situation perfectly respectable. Exertion or perseverance to make a problem or mistake unnoticeable.
Negatively, mopping may reflect annoyance that a problem is taking forever to clean up. Feeling like a servant to someone else’s reckless or messy behavior. Exhausting yourself believing that a problem needs to be perfectly fixed up.