The pieces are too large to boil in a pot. I currently have them soaking in a large bucket full of hot water. I don't want to introduce all sorts of problems into my aquarium, so I thought it would be best to ask.
you are pretty much doing it now....i usally let the wood soak in a clean plastic trash can ,and change the water once a week till the water remains clear.depending on the size of the wood it should take you few weeks
Pour boiling water on it?i usually let it sit in hot water but the hot water will lower in temp as time pass by,i guess just soak it,i use hot water to kill of anything living in the driftwood,cockaroaches,centipedes and more.
When wood or rocks are too large to fit into a pot to boil, I have placed them in a large waterproof container (bathtub has substituted before) and soaked them for days (or more, if needed) in a high concentration of ammonia. These items are then thoroughly rinsed and ONLY placed into a tank with no fish or critters until it has cycled or the existing bacteria has removed any remnant of the ammonia. Make sure you use clear ammonia, btw!
Another method I've heard of is to use chlorine bleach to soak it, then just rinse thoroughly and then add declorinator until all gone. Seems to make sense to me!
If you can fit it into a pot, definately boil if you get the chance.