Q: If a person did not know the fardhs of ghusl for years and would just take a shower when needed ghusl, and he may have gargled mouth and blew nose in the shower but don’t know 100%, will the salaah, saum etc of all these years have to be repeated?
A: If he is not sure whether he rinsed his mouth and gargled his nose, he does not have to repeat the passed years Salaah, etc.
And Allah Ta’ala (الله تعالى) knows best.
اليقين لا يزول بالشك (الأشباه والنظائر 1/183)
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