beauty supply outlets have up to 50% strength...Great link, Stick! Lots of good stuff in there as well as the comments.
I was thinking about the "bleach" part of the article, and it occurred to me that an excellent alternative would be H2O2...Hydrogen peroxide.
You can get it from the Hydroponics supply shops in 30% solution...that is too potent. A 1:10 dilution rate would give you pretty close to the drugstore stuff (3.5%).
Set up a narrow trough with plastic sheeting and soak the driftwood overnight. Then do the clean water washing.
Ain't nuthin' going to survive that!
Do NOT get it on your skin at the undiluted rate! You will not be happy.