I'm thinking get rid of the tub
Replace with a giant condom, you get in the condom, condom has an inlet on one end, and drain in the other
Squirm around in it to get clean
Maybe the inlet even mixes soap into the water!
That way there is no exposed water/steam/mold
I wonder....
How about a hot swap cmos battery?
Thinking you wire the cmos terminals to a few batteries in parallel
Or 3
And add a voltage indicator for each of them
pour maritime hydraulic oil down the drain