Moisture in the Fiat Punto?

Hi together, say one of you might have a tip why a Fiat Punto (built in 95) is so wet from the inside? We’ve already looked at all the places where moisture can come in but found nothing. That is, you sit in the car and after a short time everything is fogged and the ventilation comes with only hard. Sometimes an anti. fitting cloth helps, but that can’t be. Maybe you have a tip. Could be that this is a “punto disease”… Thank you