If a person becomes junub and does ghusl, then some maniy comes out after doing ghusl
Question

                If a man does ghusl following janaabah, then after ghusl some maniy comes out of him, does he have to do ghusl again?.
Praise be to Allah.
    The fuqaha’ differed as to whether ghusl is required if maniy 
    comes out after doing ghusl. 

    The correct view is that of the Hanbalis, which is that if it 
    comes out without feelings of desire, then ghusl is not required, because it 
    is left over from the first maniy. If it does come out with feelings of 
    desire, then ghusl is required because it is different from the first maniy 
    and was emitted with new feelings of desire. 

    Ibn Qudaamah (may Allaah have mercy on him) said: If a person 
    has a wet dream or has intercourse and ejaculates, then does ghusl, then 
    some maniy comes out of him, the well known view that was narrated from 
    Ahmad is that he does not have to do ghusl. Al-Khallaal said: There are 
    mutawaatir reports from Abu ‘Abd-Allaah (i.e., Imam Ahmad) which say that he 
    only has to do wudoo’. That was narrated from ‘Ali, Ibn ‘Abbaas, ‘Ata’, 
    al-Zuhri, Maalik, al-Layth, al-Thawri and Ishaaq. Sa’eed ibn Jubayr said: He 
    does not have to do ghusl unless there is desire. End quote from 
    al-Mughni (1/128). 

    See al-Insaaf (1/232) and Kashshaaf al-Qinaa’ 
    (1/141). 

    The evidence for that is: 

    1 – Sa’eed narrated from Ibn ‘Abbaas (may Allaah be pleased 
    with him) that he was asked about the one who is junub and something comes 
    out of him after doing ghusl. He said: He should do wudoo’. Imam Ahmad 
    narrated something similar from ‘Ali. 

    2 – Because it is one maniy so only one ghusl is required, 
    just as if it was emitted in one go. 

    3 – Because that which comes out without desire is more akin 
    to that which comes out because of cold. This is what Imam Ahmad cited when 
    he said: Because the desire is past; rather it is minor impurity for which I 
    hope that wudoo’ will suffice. End quote from Kashf al-Qinaa’ 
    (1/142). 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said: 
    The words “If it comes out after that he should not repeat it” mean: if he 
    did ghusl for that which was already emitted, then it comes out when he 
    moves, then he should not repeat ghusl. The evidence for that is: 

    1 – The reason is one and the same, so there is no need for 
    two ghusls. 

    2 – It came out after that without feelings of pleasure, and 
    ghusl is not required unless it comes out with feelings of pleasure. 

    But if maniy comes out again because of (renewed) desire and 
    gushes out, then he must do ghusl again because this is a new reason. End 
    quote from al-Sharh al-Mumti’ (1/281). 

    Shaykh Ibn ‘Uthaymeen was asked about this fluid that comes 
    out after doing ghusl for janaabah. He replied: 

    As for this fluid that comes out after doing ghusl for 
    janaabah, if there is no new feeling of desire that caused it to be emitted, 
    then it is the remainder of that for which the first ghusl was done, so he 
    does not have to do ghusl for that. Rather he has to wash off whatever of it 
    has got onto him, and he has to do wudoo’ only. End quote. Fataawa Ibn 
    ‘Uthaymeen (11/222). 

    This was the view favoured by the scholars of the Standing 
    Committee when they said: If a person has done ghusl for janaabah then some 
    maniy comes out of him after doing ghusl, it is sufficient for him to wash 
    it and he does not have to repeat ghusl, rather he has to do instinja’ (wash 
    his private part) and do wudoo’. End quote. 

    ‘Abd al-‘Azeez ibn Baaz, ‘Abd al-Razzaaq ‘Afeefi, ‘Abd-Allaah 
    ibn Ghadyaan. 

    Fataawa al-Lajnah al-Daa’imah 
    (5/325).