expression, godan verb (-su)
dirty one's hands; get one's hands dirty
Literally to make one's hands physically dirty, and figuratively to involve oneself in a morally questionable or unpleasant task. Often used when someone takes on a necessary but unsavory job.
彼は自分の手を汚さずに、部下にやらせた。
He had his subordinates do it without getting his own hands dirty.
この仕事は誰
Someone has to get their hands dirty with this job.