Your windows have an insulated glass unit (IG) that consists of two panes of glass with a metal spacer in between them that are adhesively sealed to the spacer. If the adhesive seal breaks or releases, air and moisture can enter the space between the 2 panes of glass. When this happens, you might start to notice fogging, moisture and streaking between the panes of glass.
This defect is called a Seal Failure. Because this condition is in between the panes of glass, you are not able to wipe them away.
