This is a DIY method I used to clean my hazy windows with failed seals. The total cost is small (under $100 in tools and supplies) for many windows. The method may be more difficult for some windows than it was for mine. See CORRECTIONS below.

ATTENTION: Windows may still temporarily fog up after this is done, especially on cold mornings. The primary goal is to remove the dry haze that makes the glass opaque.

Every time I walk past my picture window I'm amazed that I can see the outside (it was hazy when I moved in some years ago). Both windows I cleaned are perfectly clear (though they may seem fuzzy in photos) during the day. Replacement cost for the glass would have been very high (4-digit).

CORRECTIONS: (see Instructable below): An aquarium air pump is much better and safer than a compressor. Thinner needles are probably better. I did seal the holes with caulk eventually, on a very dry, cold day, and it fogged up in a few months, so I don't recommend this. I have since uncovered the holes and it's doing well - it fogs up a little but clears up on its own.

00:00 Intro
00:24 How Windows Become Foggy
01:25 Repair Process Overview
02:10 Tools and Supplies
10:30 Repair Process
12:08 Optional Compressor Drying (UNSAFE!)
13:00 Window Reassembly
13:35 Side-By-Side

Full Instructable here:
https://www.instructables.com/Cleanin...