Sometimes, a boy likes to have that superclean feeling.
An excellent way to irrigate one’s chastity device is to remove the shower head from its flexible hose and stick it right down in there. Be careful not to have the water turned up too high or you might flush out more than you want.
You can also reverse the flow by holding the end of the hose against the opening in the tube, but that takes too hands and is more difficult to photograph while showering alone. Obviously.