The 10 Commandments of Purging Your Beauty Stash

"Keeping half-used lotions and potions prevents you from feeling good about buying something new," Morgenstern notes. Finish what you started before cracking into the next product. If you're bored with a product halfway through the bottle, get rid of it and commit to something new. A shower with one shampoo is a lot more pleasant of an experience than one with four half-used bottles.