A: Human, why are you eating with your off hand?
B: Oh, I sprained my dominant hand. It should be better in a few days, maybe a week.
A: WHAT WERE YOU DOING???
B: Cleaning the walls.
B: Well, the kids left hand prints on the walls.
A: Just use the auto-cleaner.
B: Auto-cleaner's not rated for bio-hazardous materials.
A: WHAT DID THEY PUT ON THE WALLS???
B: Their own feces. It was disgusting. They did it while I was asleep, and it liquefied while I cleaned it. Not only was the smell atrocious, I learned in the nastiest way possible that at least one of them's been eating dog hair.
A: I think I need calming medicine.
B: You do that. I'm gonna get some more ice for my hand. -- Anon Guest
There were multiple reasons for forensics-level Cleaners, primarily of those was the pathogens present in crime scenes themselves. Second, interestingly, was the hazards of parenting. Small children, especially small Deathworlder children, have a pronounced predilection towards mess that is also bio-hazardous. Small children across known civilisation will spread about anything they can as a form of play combined with a form of expression. Learning the difference between the approved and disapproved spreadable substances.
Bodily waste, no matter which species scattered it about, is definitely disapproved. Even Havenworlder waste can be hazardous to other Havenworlders. Though the advent of Cleaners as an item of sanitary biotech helped significantly, some levels of bodily toxins require greater actions to cleanse. Some required authorisation to use and, when a house has biohazard smeared across a surface, urgency is a factor.
Through those logical steps, the parental variants of occupational injuries were both logical and shocking through their variation. It goes beyond the standards of stepping on or tripping over toys or catching diseases or infestations from their young. In many cases, it's astonishingly daft self-injuries. Like the brace on Human Zar's dominant arm.