How are company funds purified from the profits of deposits and the interest from bank facilities resulting from dealing with a usurious bank?

Usurious gains must be disposed of by spending them on Muslim welfare and giving them to the poor and needy. It is not permissible to take a portion of them in exchange for banking services, because it is not permissible for someone who benefits from haram (unlawful) money to benefit from it. Repentance from usury involves taking back the principal amount and disposing of the interest by returning it to its owners if they are identifiable; otherwise, it should be given to the poor and needy.