Translation of "Lavatory" in Chinese

- We have just cleaned the lavatory.
- We just cleaned the restroom.

我們剛打掃了廁所。

- Where is the bathroom?
- Where's the restroom?
- Where is the toilet?
- Where's the toilet?
- Where's the bathroom?
- Where are the restrooms?
- Where's the loo?
- Where's the lavatory?

卫生间在哪里？