Hi. i am new to these forums (username jdm).
i asked support about the shampoo and this was the reply.
Shampoo is the item that are required to open a Hotel can be obtained from your friends. The thing is that each player has only one of the four items in the list of gifts which can be sent to other players. The more friends you have, the higher is the chance that you will get all items you need.
If you want to get a shampoo from your friends you can provide them with the following instruction:
To send a gift please, tap the Gift button in the bottom menu -> choose a gift (shampoo) and a friend (you) they want to send it.
They can also send a gift through the Neighbors menu. To open the Neighbors menu tap the Sociality button (the button with 3 people in the bottom menu) -> another button with 3 people. To send a gift choose the Neighbors tab -> tap Send a Gift and choose a gift.
Now either support is useless or they have changed it? Probably the former :-(.