Aggghhhhhhh!!! Why can't they aim/focus? so bored of the endless 'please lift seat' 'pls watch what your doing' 'pls wipe if you miss' and then the inevitable middle of the night sitting on something wet eurgh!!
Could be a sign of something else? Does your ds 'spray' over the seat and ever get water infections? My ds was bad for this I used to tell him off all the time for making a mess but he actually needed a medical circumcision as his foreskin was scarred/too tight and turns out he couldn't help it . He wees a lot neater now!
Barring medical/SEN problems there is no excuse for a boy over 5 to make a mess, or if they do not clean it up afterwards.
Make them clean it everytime, toilet seat/rim and floor with gloves and proper cleaning stuff to make a point. Drum it into them to check the toilet after use before they walk away from it. Advise them to sit down if their aim is poor and they don’t want to clean up.