Dought & clear, - If he does ghusl following a wet dream, maniy continues to comeout of him during the prayer.

May Allah reward you with good for answering my question, but I think
that it needs further explanation of the issue of sprinkling hot water
on the private part, because the wet dream occurred at the time of
'Asr prayer, and I have a problem, which is that maniy and even madhiy
continue to come out for a considerable period after they are first
emitted. It often happens with me that one of them is emitted at the
time of prayer, whether that is because of thinking or because of a
wet dream, but in order not to miss the prayer, I sprinkle hot water
(on my private part) so that whatever is left will come out. Please
note that I do not feel any desire when I use this method. Now I am
going to make up the fast of that day that I told you about, in sha
Allah, but what should I do if maniy continues to come out whilst I am
praying? Should I pray in that case?
Praise be to Allah.
Firstly:
We appreciate this further explanation and we ask Allah, may He be
exalted, to help us and you avoid reprehensible words and actions.
Secondly:
If it does not come out continually all the time, then it does not
come under the ruling on incontinence; rather it invalidates wudoo' as
soon as it comes out, even if that happens during the prayer. The one
who is faced with that should stop praying, do wudoo' and then repeat
the prayer. He also has to do wash off whatever has gotten onto him if
what came out was urine or madhiy, because they are both najis
(impure), unlike maniy which is taahir (pure).
But the one who is praying should not interrupt his prayer unless he
is certain that something has come out of him, because the basic
principle is that he remains in a state of purity, and that which is
certain cannot be changed by mere doubt or uncertainty.
If maniy came out of a person and he did ghusl for that, then more
came out but without desire, then he does not have to do ghusl again,
but it does invalidate his wudoo'.
See:ash-Sharh al-Mumti', 1/337
The scholars of the Standing Committee for Issuing Fatwas were asked:
If I do wudoo' for every prayer and then go out to the mosque, I
always emit madhiy; can I pray, knowing that if I take a bath and go
out, madhiy will come out without desire. So do I have to take a bath
every time?
They replied:
If that comes out of you continually, then it comes under the same
ruling as incontinence, and you have to do wudoo' for every prayer
when the time for it begins, then your prayer will be valid even if it
comes out whilst you are praying. If it does not happen frequently
with you, then you have to do wudoo' as prescribed for prayer, after
washing the penis and testicles. But you do not have to do ghusl (take
a bath) for that. End quote.
Fataawa al-Lajnah ad-Daa'imah, 5/413
Shaykh Ibn 'Uthaymeen (may Allah have mercy on him) was asked: When I
finish wudoo' and go to pray, I feel that a drop of urine comes out of
the penis; what should I do?
He replied: What you should do is pay no attention to that and ignore
it, as the Muslim scholars have enjoined. Do not pay any attention to
it and do not go and look at your penis to see if anything came out or
not. If you seek refuge with Allah from the accursed Shaytaan and
ignore it, it will go away, by Allah's leave. But if you are
absolutely certain about it, then it is essential to wash whatever the
urine has gotten onto and repeat your wudoo'. Some people, if they
feel any coolness on the head of the penis, think that something has
come out. So if you are certain, then do what I have told you. What
you have mentioned is not incontinence, because it stops and starts,
whereas incontinence is ongoing and continual. But this happens after
movement and one or two drops come out; this is not incontinence,
because once a couple of drops have come out, it stops. In this case,
he should wash it off and do wudoo' again. He should always do this,
and he should be patient and seek reward with Allah.
End quote fromLiqa' al-Baab al-Maftooh, 15/184
And Allah knows best.