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

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When he wakes up and finds some wetness on his clothes and doesn’t know what it is
He noticed the smell of maniy on his clothes after he woke up; does he have to do ghusl?

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Advice to the Muslims in the West
What is the janaabah that makes ghusl obligatory?
He used not to do ghusl for janaabah out of ignorance; should he make up the prayers?
When he wakes up and finds some wetness on his clothes and doesn’t know what it is
He noticed the smell of maniy on his clothes after he woke up; does he have to do ghusl?

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