prueba del algodón
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Spanish[edit]
Etymology[edit]
Literally, “cotton test”. The phrase comes from a detergent TV ad from the 1980s[1] in which a butler passes a piece of cotton across a surface to prove that it is perfectly clean. At the end of the advert, the butler triumphantly proclaims "the cotton doesn't deceive".
Noun[edit]
prueba del algodón f (plural pruebas del algodón)