Since then, I have tried every cleaner under the dingy-dang sun to no avail, until just last week. It was like an epiphany; almost spiritual. Yes, 'midst working on something unrelated, entirely, while watching a rerun of Lost, I was suddenly compelled to stand up, and go to the kitchen cupboard for some white vinegar. And that, my friends, worked. The glass has never gone cloudy since. Magic, I say!
UPDATE: for sale in my shop!