The furniture aren't very damaged, just a bit worn.
I don't have any knowledge or experience on the subject, I'm just trying to revive them a bit. I'd rather not unscrew it or take it apart.
I found information on the topic, but I'm not sure which are relevant to my case, and I don't want to mess it up.
I think I have to use wood finish, but I don't know of which type whatsoever. And I'm not sure either wether I have to scrub it.