My house too had old 'triple track' mill finish alm storms. Servicable and ok, but the finish (is there was such a thing) was old and pitted (I'm in the Chgo area). I used a very stiff wire brush and just scrubbed the frames in place - then washed, removed all panes, the two storms & the screen, used course steel wool on frames then washed them too, (I tossed our the old alm screen and later repllaced with the fabric type). Then I simply painted with a think, glossy Rust Olemum. I don't know if it won't work with any other type paint, but the Rust Olemum was the color I wanted and the think glossy type was pretty think going on, finished vert nicely and was very self leveing in that it hid brish marks. It was a great and cheap make over. Standing back a few feet, they look as good as the new ones that cost my neighbor loads of $$$. Good luck.