Near the beginning of the 1st season of Breaking Bad explained how NOT to do it.
A great episode. Jesse Pinkman disposed of a rival's corpse by putting it in a bathtub and pouring in a couple jugs of hydrofluoric acid.
The acid dissolved the body, then dissolved the bottom of the bathtub, then dissolved the bathroom floor, then the whole mess crashed through the ceiling downstairs.
A monumental cleanup job.