Who has not ever forget the notes in the pockets of trousers in the washing machine Finished?
The consequence of this is that we end up with damaged banknotes, perhaps just faded, nobody wants that more and more desperate cases have thrown away.
Nothing is lost, In fact you can go at a branch of the Bank of Italy and let you replace.
Below is the link to learn more, even in the case of banknotes "mutilated".
http://www.bancaditalia.it/bancomonete/danneggiati
Alex Gaetani