I would just wash it like any other kitchen knife, with a bit of water and dish soap. Don't dunk the whole thing in the sink, just wipe the blade with a soapy washcloth and rinse it under the tap. S30V is a stainless, so I wouldn't worry a whole lot about rust. But if you want to take the extra precaution of oiling it afterwards, just wipe a bit of olive oil on the blade.