It was narrated that 'Aishah said:
"The Messenger of Allah said: 'Ten things are connected to the Fitrah: trimming the mustache, letting the beard grow, using the tooth stick, rinsing out the nostrils with water, clipping the nails, washing the joints, plucking the armpit hairs, shaving the pubic hairs, washing the private parts with water.'"(One of the narrators) Zakariyya said: "Mus'ab said: 'I have forgotten the tenth thing, but it may have been rinsing out the mouth.'"
English reference: Vol. 1, Book 1, Hadith 293
Arabic reference: Book 1, Hadith 308