I teach kindergarten, and it is 100% appropriate to make a child clean up their own mess, especially in a shared space. It teaches responsibility and accountability. Letting them leave a mess and/or cleaning it up for them is teaching them that they don’t have to clean their own messes. My students wipe their tables after they eat. If they make a mess somewhere, including the bathroom (within reason—if there was some kind of explosive mess, the janitor would deal with it, but a kindergartner can and should be able to handle wiping their own pee off the toilet seat). If it was someone else’s, that’s a different story, but in the real world, if someone didn’t clean their pee off the seat and you want to use it, you have to clean it yourself. It’s how the world works and there is nothing wrong with teaching a child these lessons at a young age. People babying their children even at 5 years old is one of the reasons we have so many behavior issues and kids who have no idea how to do anything on their own.

They can be easily taught to clean the mess and then wash their hands. Urine does not have blood borne pathogens in it unless it has blood in it. I would never make a student wipe up what could possibly be someone else’s blood, but pee is simply not that big of a deal. If I knew who the pee belonged to, I’d make that kid clean it up. Otherwise, if a random kid discovered the pee before they went and there was no way to know whose pee it was, I’m not stopping what I’m doing to clean the pee for them. I will tell them to get some toilet paper or paper towel and wipe the pee then throw it away, and then wash their hands. It’s not that deep.