You let the bath pump prime itself while you disrobe.
You get into the tub and the valve begins dispensing warm slime, the pumping mechanism churning loudly to force out its viscous load. You shuffle your bum a bit so your body doesn't dam the slime. The heavy slime finds its level and pools itself in all your crevices.
You lie back, buoyed and enrobed by the warm slime like volcanic mud. You doze.
When you're ready to come out, you pull yourself out by the handles set into the wall, until the slime releases its grip on your carapace, pulling off all the dirt with it.