wash one's hands or wash one's hands off

[Allthewayanime]

Which is the correct idiom because so far I've seen them both?(wash one's hands off or wash one's hands of)

[Dozy]

The idiom is "wash one's hands of (something)".

"wash one's hands off" is wrong (or has a usually ludicrous meaning of washing so strenuously that one's hands fall off).