If you have ever asked yourself. Why do i have moisture on the inside of my house windows your 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. We will also give you a few ways to resolve this problem.