Bought a new bottle of rice vinegar about a month and a half ago. I've used
maybe, I'd say, 4 tablespoons for sushi and also for a cucumber salad.
Opened the cupboard today and it has this transparent filmy substance on the
bottom of the bottle.

Isn't vinegar sterile? What is this muck? I'm obviously throwing the
bottle away, but I've never seen anything like this in a bottle of vinegar
before. It kind of looks like a thin jelly-fish.

kili