So what was the ooze in the boxes in strangers things 3?

They use one of the canisters to prop the door to escape which smashes it and releases the ooze. Its not really explained what it actually is and its completely forgotten about even though they hyped it for like 3 episodes. Obviously its irrelevant but still wondering what it could be. My only guess would be fuel... show more They use one of the canisters to prop the door to escape which smashes it and releases the ooze. Its not really explained what it actually is and its completely forgotten about even though they hyped it for like 3 episodes. Obviously its irrelevant but still wondering what it could be. My only guess would be fuel for the machine? idk
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