godan verb (-u), transitive verb
General physical washing: hands, face, clothes, dishes, etc. The most common sense.
食事の前に手を洗ってください。
Please wash your hands before meals.
彼女は毎朝
She washes her face every morning.
godan verb (-u), transitive verb
investigate; look into; scrutinize
Figurative use: to examine or investigate something thoroughly, often used with 身元 (identity) or 過去 (past).
警察は彼の過去を洗った。
The police investigated his past.
godan verb (-u), transitive verb
purify one's heart; cleanse spiritually
Literary or spiritual use: to purify one's heart or soul, often in a metaphorical sense.
滝に打たれて心を洗う。
Purify one's heart under a waterfall.