I think I'd stay away from the chlorine unless of course you think the
cutting board is harboring the plague, dengue fever, or something.
Juice a couple of lemons. Apply the juice to the wood, then sprinkle it
liberally with salt. Let it stand for a while, over-night even. Then
scrub the board with more lemon juice and salt. After the scrub, put it
in the sun for a few hours.

It's an old way of sanitizing but it works fine.