فُلَانٌ نَظِيفُ الْيَدِ.
So-and-so has clean hands.
The phrase may imply probity and freedom from dishonest dealings. In an appropriate context, literal cleanliness also remains conceivable—a feature relevant to distinguishing kināyah from metaphor with an excluding clue.
The expression is not invariably a figure. In a lesson about hygiene, the same words may be plainly literal; interpretation depends on the actual communicative purpose.