soak
She soaked the T-shirt overnight to get rid of the stains.
Go to the thesaurus article about these synonyms and antonyms of bathe.  
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If you wash something, you use water and soap to clean it.

bathe | American Thesaurus

bathe

verb
These are words and phrases related to bathe. Click on any word or phrase to go to its thesaurus page. Or, go to the definition of bathe.
We bathed in a cool mountain stream. She bathed the child in a plastic basin.

Synonyms