Thanks. I was most concerned about the milk and the mayonnaise. I think the mayo is okay; the milk not so much. And the half of an onion got pretty icky, but I don't know whether that was because it warmed up too much, or (more likely) because it froze when the fridge to over-enthusiastic at some point before the power went out (it freezes things sometimes) and a bunch of cell walls ruptured. Mostly I was just being extremely grumpy and it was one more thing to be grumpy about.
Ah, I forgot about the possibility of mayo. If it was still cool to the touch it's probably ok; if it warmed up to something closer to room temperature I'd probably toss it (on the "toss the potato salad at the picnic after three hours" principle). But I don't do a lot with mayo myself so I'm just channeling my mother here. :-)
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