Before you can get organized, you have to know what to keep and what to toss. Throw away anything that has a strange odor, has changed colors or has dried up inside the container. You should toss cleansers and moisturizers after six months since they can contain acids that can eventually turn rancid. Mascaras should be thrown away after three months because the last thing you want is an eye infection from old, clumping bacteria. Oxidation can cause fragrances to change scent after two years, so anything older than that should be trashed.