What is the right way for tahara after Janabah. Do I have to wash my hair or just touch my hair with water just like Wudu.
All perfect praise be to Allaah, The Lord of the Worlds.  I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
Ghusl Al-Janaabah (major ceremonial washing of the whole body after sexual intercourse) can be performed in two ways:
The first way is sufficient but not the better way. Here, the person has to pour water over his/her whole body including the roots of the hair and what is between the fingers and the like with the intention of purification from Janaabah (post sexual-intercourse impurity). 
The second way is preferable as it fits what the Prophet Muhammad  used to do as narrated by 'Aa'ishah and Maymoonah
   used to do as narrated by 'Aa'ishah and Maymoonah  and is found in Al-Bukhari and Muslims collections of Hadeeth. This Ghusl is as follows: First, the person washes his/her private parts and then makes Wudhoo' (ritual ablution) as is usually done before prayers; then he pours water on his/her head three times such that the water gets to the roots of the hair. After that, the person pours the water over his/her whole body and finally washes his/her feet.
  and is found in Al-Bukhari and Muslims collections of Hadeeth. This Ghusl is as follows: First, the person washes his/her private parts and then makes Wudhoo' (ritual ablution) as is usually done before prayers; then he pours water on his/her head three times such that the water gets to the roots of the hair. After that, the person pours the water over his/her whole body and finally washes his/her feet. 
Rubbing the hair is not sufficient in both ways, as the water has to reach the scalp. 
Allaah Knows best.
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