It's a glass case for displaying things. Even the sides have milky spots. It was stored in the basement. They used a dehumidifier, but I wonder whether the humidity still managed to cause the milky white spots. It's not like a ring you'd see on a coffee table from a glasses' condensation where the person failed to use a coaster. It's more like a cloudy mess in spots. I've tried photographing it, but it doesn't show up in the image. I tried your remedy and it helped to remove a lot of the grime, but it did nothing for the milky spots. You reckon I'll have to strip it? I might be able to paint over the milky spots, but I'd have to paint the whole thing. It's black. I'm not sure what kind of wood is underneath.
I don't mind stripping it or repainting it, but I don't want to do more damage than has already been done. Though I'm not sure why I'm so protective of it when my kids have already called "not it" when it comes their turn to inherit the thing. It's pretty unique looking, but it has a sweet story of origin. My great-great-great-grandfather couldn't afford to buy one for his daughter when she got married and it was something she really wanted, so he made her one instead. Ever since then, the women in our family have received a display case as a wedding gift, to hold their new keepsakes, knickknacks, and other special mementos in. Huh, that sounds pretty sexist now that I think about it. Well, I'd gift one to any son or daughter of mine who was starting out on their own whether they were married or not.