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Sometimes it is, sometimes it isn't. I know lots of people are using the food grade ones from Brute. For that one brand I can say that there are enough people using it that if it were going to create a problem we'd have seen it by now. But I don't know that we can lump all of them together and say anything that applies to all brands.

To clean it up, I'd go with soap then lots and lots and lots of water. When you think you've rinsed with enough water, rinse again with three times that amount. A wipe down with vinegar wouldn't be a bad idea too.

Of course all of that is assuming that it doesn't have any type of antimicrobials in the plastic and that there are no mold release agents that could leach.