I shower a lot, so I can justify the shower gel lakes and soap mountains. But I don't have much hair, so shampoo is excessive at best and CONDITIONER??? - well, I say I'll give it away to my female friends, but it just sits there in my bathroom. Mouthwash goes unopened as I always just have a huge bottle at home and my little toothpastes are quickly multiplying.
Anyway, I was glad to discover that one of my favourite comedians, Stewart Lee, has exactly the same problem, and that he employs exactly the same tactics. And he writes about it with more wit than I could, so for your reading and relating pleasure:
HARVESTING HOTEL TOILETRIES