https://www.cnet.com/news/i-took-out-a-game-of-thrones-white-walker-before-it-reached-winterfell/

I stabbed his chest with a dragonglass dagger -- so, yes, it wasn't Valyrian steel just like Arya's. Also, I didn't leap through a frosty haze with the stealth of a trained assassin. My duel was punctuated by my flustered shrieks of terror, and my attack was mostly repeated clumsy jabs of my weapons in the general direction of my foes. Also, this wight and White Walker were both digital apparitions incapable of laying a finger on me. 

But other than that: just like the real thing.