So I ponder what to do - they don't really train you for situations like this. (At least the protocol wasn't in that useless information that they send you home from the hospital with.) I ended up taking baby out of the tub and standing him up next to it. Then I scooped out the poop globules with my hands and put them in the toilet. Then I put baby back in the tub - I still had to clean him anyways - what's the point of changing the water?
So that's the story.