I'm reminded of a story from a HN commenter who was a US soldier. He said in his unit he's been trained and tasked with cleaning rifles with brushes, rags, (no

I'm reminded of a story from a HN commenter who was a US soldier. He said in his unit he's been trained and tasked with cleaning rifles with brushes, rags, (no gloves) and an unlabelled liquid cleaning product. After years of doing that, one day he stumbled upon a label for that product, which said (paraphrasing) that it was a dangerous carcinogen chemical and should never come into contact with skin.