Personally, I like algae growing on the driftwood. It often forms a beautiful
lawn, and adds to the natural beauty of a tank.
But if you want clean driftwood, get a clown pleco. It doesn't get very large,
and will keep your driftwood so clean it looks like it's been sanded. (They
are wood eaters, and constantly rasp the driftwood.)
Leigh
http://www.fortunecity.com/lavender/halloween/881/