No, you don't have to use bleach. Sometimes too, I forget and use the term "bleaching" as a catch-all phrase for any disinfecting process. Especially when things get "sun bleached" like my hair in the summer. But you could use chlroine bleach if you wanted too, probably wouldn't soak it in there for more than 24 hrs, then I would soak it for a week using your dechlorinator and changing the water frequently. Contrary to popular belief, -small- amounts of bleach in your tank probably won't hurt anything, espeically if you use a stress coat/novaqua/aqua plus/tap water conditioner product after you put it in the tank.
Scrub it down with a brush under running water if you want too as well, that will clean everything off the surface. But eseow is pretty much right, the boiling should've sufficed for disinfecting.
~~Colesea