wash your hands of
wash (one's) hands of (someone or something)
1. To absolve oneself of or distance oneself from responsibility for something. I don't want to be part of this scheme any more. I wash my hands of it.
2. To renounce, abandon, or distance oneself from someone or something. The director famously hated the final cut of the movie and has washed his hands of it, even going so far as to remove his name from the project. I'm afraid that if I tell my parents what I've done, they will wash their hands of me.
wash your hands ofdisclaim responsibility for.
This phrase originally alluded to the biblical description of Pontius Pilate, who, when he was forced to condemn Jesus to death, sent for a bowl of water and ritually washed his hands before the crowd as a sign that he was innocent of ‘this just person’ (Matthew 27:24).