Reference:
It's probably because shower gel is so difficult to wash with, and probably not very good for your skin either. Try him on a bar of soap.
We only have bars of soap in our house, yet the suds still manage to reach inexplicable heights and far reaches across the walls, and that's just the adult male in the house.
Don't get me started on what the boy of the house can do to the bathroom
I am honestly considering making the boy go out the side of the house to use the toilet with the dogs. Mainly because that is Mr Cinds duty to clean up