I spoke with the FM Manager in another temple. He said vinegar is not on the list of cleaning materials recommended by the Church, but that it was the option of the local temple facility manager to determine if it was allowed to be used. The problem, he said, is that too many "helpful" folks tried to use more than just vinegar. It almost always came with additional that actually did harm the materials being cleaned.
So most temple facility managers stick with the list sent from the temple department. Vinegar is not on that list as one of the recommended cleaning agents.