I have a house that is about eight years old. All of the windows are dual pane and a few have lost their seal over the years. These are very large (and very expensive) windows. The window glass itself is in excellent condition, but here in Arizona a lot of dust and water got in there at some point and the window always looks terribly dirty.
It would seem to be a waste to completely replace it - is there a way to get it cleaned out and resealed?
Most windows nowadays have insulated glass units (IGU's) that are sealed together. Once the seal fails, you may notice moisture between the glass, or dirty streaks that obviously cannot be cleaned from either side. Sometimes they will even become white with mineral streaks.
Some companies advertise that they can "pump" or "reseal" such windows. In most cases, this "service" is pure bunk, because not ever IGU can be repaired, many are too far gone, those with junk between the glass will remain dirty looking, etc.
The best thing to do when you have a failed IGU is to replace it. This can usually be done by any glass shop in your area. Unless you have a very good dealer in your area, and you are the original owner, you can probably forget any type of warranty. But it's worth checking into.