It's unclogged!

UNCLOGGED!!!

So yeah, a second heapin' helpin' of the devil juice finally got my drain drainin' again.  A pleasant side effect is that my kitchen sink now empties like a champ. Unfortunately, the little bit of acid that splashed in my tub and removed (quite effectively, I might add) a patch of soap scum revealed just how built-up it is in my tub.  Egad.

Off to the store for some scrubbing bubbles and a stiff bristled brush.