dialogue: Mark: So what's wrong with the drain?
  Dulcia: It's clogged and water won't go down.
  Mark: Let me take a look. You know why? It's clogged with hair. No wonder water won't go down.
  Dulcia: Well, I guess people who lived here before didn't clean the bathtub.
  Mark: You're darn right!
  Dulcia: What should I do now?
  Mark: Don't worry. I'Ve got some acid here. It will help dissolve the hair down there.
  Dulcia: Ur, it stinks!
  Mark: Now you know you have to clean your bathtub every time when you use it.
summary: Mark helps Dulcia to dissolve the hair that clogs the drain and tells Dulcia to clean the bathtub.