Oy was developed by Inge Louf, a pharmacist who was looking for a solution to the unpleasant odor of her sons' sports shoes. Four years and 271 attempts later, she launched Oy, a series of products that gently tackles sweat odors. We are especially fans of the Deo Wash. You let it soak for a minute on dry skin. Then you moisten the skin, which converts the transparent gel into a milk that nourishes the skin. Finally, rinse and dry thoroughly. The result? Sweat odor free for 24 hours without deodorant.