Im convinced most the piss you see all over the place is from little boys

Also accepted: grown women doing the hover-and-spray.

Source - cleaned public restrooms. Don't get me started...

Just my opinion but you can teach children not to do this.

You patiently but firmly get them to clean it up when they do it. They don't get to do anything else until it's done. They will stop doing it.

You don't do it if they were panicked, half asleep, or not feeling well and if they need help doing it, you help, but you don't just let them walk away from it if it happened in the normal course of events (and yelling "you peed everywhere again" doesn't count).

This is the kind of thing you have to do. It's easier to just yell at them and clean it yourself. It's actually much easier.