So the question is: what formulation of Windex did you use? Around here we can buy Ammonia free (for cleaning the picture frames with UV glass), the old plain blue "Windex", and now some kind of new Eco friendly formulation.
Ive had varying results dial cleaning with dilute oxalic acid and citric acid (lemon juice). Across the board it seems dial cleaning is best reserved for clean dials with discolored/flaking cellulose based laquer.
Did you respray the dial with a laquer or preservative to protect the paint layer?--Something I'be always thought should be done but that is complicated by dial markers, etc that would have to be masked or removed prior to spraying. I've got a hand pump olive oil sprayer that comes out in a vapor mist... Maybe I should experiment on the next re-dial candidates that I pick up.