Recently I was staying in a 5* Hotel.
I asked the room service attendant what they do with the soaps?
He answered, If they are unused we will leave them if they have been used will will throw them out.
I gather from that, if you use a little of the soup and/or shampoo you should be able to take the rest home and have no guilty feelings what-so-ever.
Taking Towels On The Other Hand Is Totally Wrong…