wash one's brain out with soap
From Wiktionary, the free dictionary
Etymology
From the idea of washing one's mouth out.
Pronunciation
Verb
wash one's brain out with soap (third-person singular simple present washes one's brain out with soap, present participle washing one's brain out with soap, simple past and past participle washed one's brain out with soap)
- (colloquial, humorous) To remove or erase unwanted images from one's mind.
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