Rear window frost/fog on the inside...

[pgfreak]

At night, I've been noticing the inside of the rear window is actually frosted up or really fogged over (2door- hatch type)... takes a while for me to sit there with the rear defroster on to get rid of it, since i basically cant see past it.
Could there be a weather stripping leak or something?
I really dont see this happening in too many cars. Any way to prevent this?

[3weddings]

http://www.redflagdeals.com/forums/showthread.php?t=669857

Someone asked a similar Q this morning

[Karbaum]

Take your heat off recirculation and put it on fresh.

[bembol]

I turn the A/C on.

Rain-X Anti-Fog somewhat helps.

[pgfreak]

I usually have the heat on the one that defrosts the front window.
Once the front window is defrogged, should I change it to AC ?