Does the bathroom itself have that recently-cleaned disinfectant smell too, or just the ceiling crawlspace? And is there anything in the bathroom that could be used to easily crawl up to that loose ceiling tile, or anything portable in the janitor's closet like a stepladder that could have been used and shows signs of recent use?

Also gonna do a full sweep of the bathroom now for anything that seems damaged or might have any bloodstains that were missed.