Andy, a trainee at Silogan Diner, was tasked to cook the breakfast adobo. After cooking, one of the customers complained that her food tasted weird, and a few minutes later, that customer started vomiting.
Andy said she used the vinegar she found under the counter when asked what happened. The manager told Andy it wasn't vinegar but a reused vinegar bottle filled with a cleaning solution. How would you categorize the contaminant, and what would you recommend to prevent this from happening?