This is a modification of Inge's
Spongebath_patch to allow children. Thanks Inge for allowing me to post it here.
Sims from children to elder can autonomously "sponge bath" from a sink, or being directed by player. I modified it for the apocalypse challenge, in which showers and tubs are not allowed until medical career is unlocked.
It works with my EP config: all EP up to AL, plus IKEA.
Known issue:
Animation of children is a little off. They are lifted a step-stool's height up.