Cleaning Glass….what works

I have some storm windows that haven't been cleaned in several years and it has this hazy build up on the bottom and runs a few inches up. Nothing seems to cut it and I've tried a bunch of different products including straight ammonia and various cleaning/polishing compounds. Even tried oven cleaner lol. Anyone have any ideas how to get the haze off? It's not the whole window but just the very bottom that was close to the ground....
Author: Cranky