I had the same problem with my windows. I talked to several contractors and they all told me to run a dehumidifier and vent fans when we cook and take showers. We did this and it has helped we don’t have the problems anymore.
I ran a 3″ pvc pipe from just above the floor up through the roof (10′ above roof line) with a vent cap helps get some of the moisture out plus it takes the oders out and 10′ higher than you blind
This is the first thing that I thought of. I’m just not sure if it’s safe of plexiglass. You could try a small amount in the corner of a window and if it works. It’s a cheap thing to try.