foggy window repair 4

https://astro-wiki.win/index.php/The_Essentials_of_Commercial_Glass_Repair:_What_Building_Owners_Need_to_Know

You notice the double-pane window in the kitchen is fogged up between the panes, a sign the seal has failed. Instead of replacing the whole window, you carefully remove the glass, clean off the old sealant, and apply new butyl tape. After reassembling, you wait for the clear view—no more mysterious condensation.