Fogged side front window

We have an 05 Holiday Rambler Admiral. The front side stationary passenger's window has become fogged. This is a double pane window, therefore it can't be cleaned between them. Anybody else have this problem and is there a fix or replace? Any help would be appreciated.

Very common with Se-Gi windows. Best place I can recommend is Suncoast Designers Inc located in Hudson, Florida. Talk to Jeff Heyen ... 727-868-2773. I paid $225.00 per window and over the past 6 years have had all 9 windows in my coach repaired.