Daisy: I think our school toilets are very dirty and smelly, I'm so worried students of our school will get health problems. What do you think?

Jason: I'm worried too. I think there are eight blocks in our school and students of each block must be responsible for the toilets there

Daisy: That's right. Shall we hold the cleanest toilet of the month competition and give the trophy to the winner?

Jason: I think that's a good idea. We need to talk to the principal soon.

What is the main topic of the dialog?