Good point about hosing out the tank. I use this thing, which connects to a garden hose.
It has a small flange just above the nozzle, which I hook under the edge of the down-pipe while I rotate the nozzle around in the tank. The flange prevents the spray from hitting the inside of the down-pipe and spraying up at me.
And up in the bowl, the larger flange is all splash-guard.
Recently, I broke the tip off by stepping on it. I'm becoming clumsier with age. lol
You can buy such wands, but I customized mine "a little".
As for young boys failing to aim properly.... All my life I have preferred to sit, even "only" to pee, when a clean seat is available.