Advice of Scholars - FARDS OF GHUSHL
According to the Hanafî Madhhab there are three fards in a ghushl:
1 - To wash the entire mouth very well. Drinking a mouthful of water will do, yet some (savants) said that it would be makrûh.
2 - To wash the nostrils. A ghusl will not be accepted if one does not wash under any dried mucus in the nostrils or under any chewed pieces of bread in the mouth. According to the Hanbalî Madhhab madmada and istinshaq are fard both in ablution and in ghusl. (See the previously explained eighteen sunnats of ablution).
3 - To wash every part of the body. It is fard to wash every spot on the body if there is no haraj (difficulty) in wetting it.