For the driftwood:
1. Use a wire brush & scrapper to remove any loose stuff.
2. Rinse with high pressure water jet.
3. Optional - sterilize by:
pouring boiling water over the whole thing,
soaking in brine for a few days then rinse to remove salt, or
Bleach in 1:10 bleach - some think that you cannot remove all traces of bleach, even with dechol.
For the plants (live I presume):
1. Trim off all rotting or damaged leaves
2. Bleach in 1:10 bleach for 30 sec. - note that some plants like vals, hornwort & many weak plants will be killed by this.
3. Instead of bleach, QT the plants for 2 weeks without fish.