This is one of those things I struggle to do. Use the stuff you have. I have a stash of body wash, shampoo, lotions, face creams, you name it. I probably could go months without having to buy health and beauty products.
Challenge yourself to take a quick inventory of the stuff you have in your bathroom cabinet, and then don't buy anything until you're completely out. It's not as easy as it sounds. You see the Sunday paper with the ads tempting you with buy one get one free, or 30% off the expensive drug store eye cream, it's easy to think you can't pass up the deal.
In reality, if you use the stuff you have until it's all gone, you will very likely save hundreds of dollars a year, and have less clutters around your house. This holds true for pantry items, cleaning supplies, and clothes! Yes, clothes, too.
Give it a try and you might find you like not having extra stuff everywhere. I'm fairly certain you'll like the extra cash in your wallet!