1. Study until out of Spirit and then rest until Wed
2. Wed morning (8:00) exit the room and into the corridor. Turn off the heater. Then go back into your room and delay/play until 17:00. Go back into the corridor and open the bathroom door and walk in.
3. Grab the Shampoo bottle and click on the bath to view scene
4. Leave , get caught and select last option (unless you want to get punished)
Is this where you are stuck? On 3?
Did you Turn off the heater? (you need to do it at the same day , if you sleep then it wont work. You will need to redo it)