If he touches his private part during ghusl, does he have to repeat wudu?

If a man wakes up and finds some wetness but does not know what it is

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

He delayed the prayer until the time for it was over with no excuse; does he have to do ghusl?

He became junub in his friend’s house and he is afraid that he may be accused of impropriety

He did ghusl then he realized that the water had not reached his foot

He did ghusl and prayed, then he realized that he had missed a part of his body and the water had not reached it

In ghusl it is sufficient to make the water reach all areas of the body