Most of my life, I was employed by large teaching university hospitals with a variety of house keepers. Our health depended on who was the house keeper. The best house keeper we had kept her own stash of BLEACH. Using bleach was against all the rules. However, bleach was/is a great cleaner.
Better to survive than follow blindly! I wonder how she knew who she could trust, or was she open about it? FYI what bleach doesn't kill, ammonia probably will. I used to clean slimy flower containers for a florist. She said both bleach and ammonia had to be used together because otherwise the slime wouldn't die. She wanted me to mix them (and get asthma or intoxicated...) but I just washed them all twice, once with bleach and once with ammonia. Nice working alone, lol. I think most florists simply keep the water in their arranged flower vases fresh. This was a weird florist.
When she trained me, she warned me that customers would come back for refunds when rose heads fell over. She said, "They just don't want to pay for a new one! Theirs is OLD!" but the truth was, her roses were so cheap that the heads fell over on the 2nd or 3rd day. A fresh rose should last at least 4-5 days. Bad florist. She later became a counselor. I wonder how that's going, lol.