Sorry to hear that... If he was a decent and sensible person he would offer to pay for cleaning and detailing.
Related story: A few years ago in my previous car (a somewhat new at the time Honda Accord), I had two people simultaneously throw up on my car. The front passenger wasn't functional enough to open the window so instead he threw up all over the front carpet mat.
The back passenger (sitting on the same side as the front passenger) had no window since it was a two door coupe
So I was expecting for him to projectile vomit all over the front passenger. In a somewhat surprising move, he sacrificed his dignity and his clothing and instead chose to vomit all over himself. So there we were, at 2am driving on the freeway with vomit all over front carpet and my back passenger bathing in a pool of his own vomit. He honestly looked like he just came out of the womb and was covered in amniotic fluid. I was laughing so hard it was hard to be mad.