Possibly not being fobbed off with that answer - if the mats are wet from your shoes, then there's a ready made source of moisture inside the car before you even think of leaks/pollen filter etc. Mine was bad when I had carpet mats in, but ten times worse after I changed the carpet mats to rubber ones which could have standing water on them when I left the car. If the car was warm, that water has to go somewhere when it evaporates, and that somewhere is on your windows. My Octavia is just as bad as the Leon.
