I wanted to ask that what are the farz of ghusl ? As the laws are same for any type of ghusl is it necessary to follow the sequence like 1st we make the niyat then we must wash our hand and rinise the mouth then one should wash the part which has najasat and then one should make the wudhu and then wash his full body and pour water 3 times. Is this sequence is necessary and does doing wadu is necessary too ?

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In all kinds of the ghusl 1st you should wash the najasat part and then do your niyyat and wash the head and shoulder then right sight of your body and then left side. Wudhu zaruri nahi or 3 baar dhulna zaruri nahi