What is the ruling on dealing with money deposited into a person's account, after it has been invested in usurious banks and other institutions, and how can one dispose of it if it is unlawful, knowing the difficulty of returning it to the relevant parties?

"Profits resulting from bank deposits with usurious interest are not permissible to benefit from, except for the poor and needy to the extent of their need. Any surplus should be spent on general Muslim welfare. 'If forbidden money is spent, it becomes permissible for whoever rightfully receives it, just as it is forbidden for whoever wrongfully consumes it.' As for profits resulting from companies and factories operating in permissible fields, they are permissible. Therefore, if the grants provided by the state are derived from usurious interest, the recipient takes them; if he is poor, he may benefit from them, otherwise he should spend them on charitable causes. If the grants are derived from investment in permissible areas, then they are permissible for whoever receives them in their account."