Exfoliate, exfoliate, exfoliate!!!  Before you come in to tan, cleanse yourself of any products that will prevent you from having a flawless tan.  Shower to remove any lotion, perfumes and/or deodorant along with dead/dry skin.  Seriously, I have had green armpits because I didn't believe the warnings...no one wants green armpits!  After your tan, moisturize your entire body to keep a consistent and flawless tan and to ensure uniform tan fading.