If you have ever asked yourself.  Why do I have moisture on the inside of my house windows? You’re not alone and by between I mean between the two panes of glass.  Moisture can find its way between glass windows when the seal fails.  This is a common problem with double pane windows.  The moisture once inside the windows of your house can stain the glass, corrode the spacer, and further destroy the seal leading to more moisture.  Unfortunately there is no way to “fix” the problem without replacing the insulated unit that’s damaged.  There are multiple ways to do this in our opinion the best way if possible is to order a new sash from the manufacturer.  When and if that is not a good or available option a local glass company that deals with windows should be able to help you replace the insulated unit and take care of the problem.