Wooden cutting boards are one of those things you always want to keep as clean as possible. So, it's a good idea to let it soak in a vinegar solution every now and then to make sure that it's totally disinfected. Just mix around four parts water and one part vinegar and let your board soak for a couple of minutes. Next, rinse it down and dry it to avoid messing up the wood.
The disinfecting process gets it much cleaner than if you were to just wash it the same way you wash your dishes. It's also a good idea to rub it down with a tiny bit of oil to prevent warping.