Before discussing the way of Ghusal let me tell you in which conditions it becomes due.

Man:

After Ehtelam, Night Fall, Nocturnal Ejaculation, When he sees semen on his cloths after awakening

Ejaculation of semen by hand practice, masturbation etc

Penetration in the vagina by the penis, no matter ejaculation happens or not.

Woman:

Penetration of penis inside vagina no matter ejaculation happens or not

Penetration by finger inside vagina especially during sexual arousal, no matter fingering is done by husband or by herself

After menses over, After perpurum ( period of 40 days after delivery)

Bad dreaming, when she find her self wet on awakening

Method of Balneation (Ghusal):

1. Nyat for Ghusal

2. Cleaning of the body so that impurity would be washed out

3. Three times gargles with water ( Not allowed in fasting)

4. Three times ascending water in the nose (Be careful in fasting)

5. Performing Whole Wazoo (Abdest)

6. Running water though out the body in such a way that not a pinpoint area would be left with water. ( Women can open optionally their hairs and then run water over the head, however; they can perform ghusal without opening the hairs if they wish)

7. Recite the dua for performing Ghusal