There are a few small businesses, which have the ability to remove the moisture from between the thermal panes of glass in windows for less than $150 each.
Using a special tool, they drill a small hole in the glass at two opposite corners, pump in some chemicals, rinse with a drying agent and plug the holes. They claim the moisture will not reappear for at least 20 years.
It is important that the business have enough liability insurance to cover the cost of glass replacement should a crack or chip in the glass occur during the procedure.
Please note that this service removes only the moisture and will not remove any milky streaks.
Also, this procedure cannot be performed on tempered safety glass, which includes all sliding thermal pane glass patio doors.