03 Imp interior window condensation

Hope someone has a suggestion.
We have an 03 Impala that we purchased new. Every winter we battle with the glass fogging up on the interior of the vehicle. So far, nothing we have tried has worked; the dealer has offered no solution.
 
thanks!

Have you tried FogX made by RainX?? You can get it for $5 at wal-mart or autozone. It keeps it from fogging but you end up with water. Try it if you haven't and see if you like it.