...wash his hands clean...

[Tan Elaine]

He washed his hands clean of loan shark activities when people borrowed money and could not return him anything.

Is the boldfaced expression used by native speakers?

Thanks.

[SlickVic9000]

(Not a Teacher)

Yes. Sometimes we say it without "clean".

"I washed my hands of the loan shark business a long time ago."

[Rover_KE]

In BE we don't use clean in this expression.

Rover

[SoothingDave]

This concept is right out of the Bible.

Pontius Pilate - Wikipedia, the free encyclopedia

Pilate agrees to condemn Jesus to crucifixion, after the Jewish leaders explained to him that Jesus presented a threat to Roman occupation through his claim to the throne of King David as King of Israel in the royal line of David. The crowd in Pilate's courtyard, according to the Synoptics, had been coached by the Pharisees and Sadducees to shout against Jesus. The Gospel of Matthew adds that before condemning Jesus to death, Pilate washes his hands with water in front of the crowd, saying, "I am innocent of this man's blood; you will see."