UK audi

Ok please can I have some help here from any one who knows? I have a b7 A4 soft top, Now the winter has set in ,im finding my front window steams up and does not dissipate, Now, I know it’s a case of turn on the aircon and this will take the moisture from the air and clear the windows, this is the case for every window except the front, I’ve tried every combination on the split aircon panel . Any ideas .