I've never had to do it, Chris. But, I know how it is done. This is what I'd do if I were in your shoes...Dilute the bleach the same as it says on the bottle (okay, maybe I'd put a cup or two more per gallon) filling the tank to the top with water and letting it sit for an hour (definately an outside job!) or two. If I was doing a gravel substrate, I'd have that in there and stir it up every 15 minutes or so - if it is sand I'd stir more often or toss the sand. I'd dump the bleach water, rinse everything with regular water, refill tank add dechorinator - stir up substrate and repeat the rinse refill dechlorinator thing at least one more time.
That should kill anything lingering in the tank. I'd boil the wood and anything that I didn't want to toss and couldn't bleach.
