Question Summary:
Mistake in doing Istinja

Question Detail:

After defecation i use too much water for istinja.. while doing istinja i also wash inside the anus as i didnt come to satisfaction level.... the question is
1) when i do istinja and stand up, water comes out from anus, is that water is pure?
2) because of washing too much inside the anus a white fluid comes out, should it be washed or only stool? is this white fluid is pure? should i wash only feces or more than that? kindly help me...JazakAllah
please help me..... other websites are not working which is mentioned.. i am in a great problem.. it is difficult to me to salah as when i go for sajda, drop comes out and i thought about validation of Salah.

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh. 
Firstly, it must be noted that one should not wash the inside of the anus while doing Istinja.[1] The Fuqaha (jurists) have prohibited this, and this can be detrimental to one’s health. Washing the outer part is sufficient. After doing so, you should regard yourself to be cleansed and ignore all other thoughts. 
Whatever fluid comes out of the anus invalidates the Wudhu and will be regarded as impure.[2]
You should also seek medical attention for your condition.
 
And Allah Ta’āla Knows Best
Arshad Ali
Student Darul Iftaa
Trinidad
Checked and Approved by,
Mufti Ebrahim Desai.
http://www.daruliftaa.net/