Exactly! You can put any and everything into water at home , but if you do it for a living you get screwed.
I dont know the technicalities , but I use detergent free, so thats detergents off the list.
now lets look at worst case vomit, urine, faeces and blood. I have flushed all the above down the loo at some time. My kids (and very occasionally me
) have accidents in the bath. And I have lost count of times people stand over a sink with a nose bleed.
Anything else should be natural material such as dust, soil, and all manor of organic organisms etc which some of which would naturally make its way out to the open in the air or via foot traffic.
Like I said im no expert so happy to be corrected but thats how I see it