At this point, you really should know that you need to dissolve them like that movie, and unplug the drain.
Now that I think about it I can't really remember much about where exactly I saw that scene...all I remember is that the detectives, after investigating the motel room in which he dissolved the body,their only clue was the tape residue left on the walls (he covered every inch of the place with plastic sheets).
You know what, sure, I'll be a little animal, not like it could get any worse, right?