Use baking soda or vinegar. Or dry orange or lemon peels in a warm oven until crisp; grind to a powder; mix 1 cup baking soda with ½ cup of the peel; a cup of powdered clay can be added as an absorbent and extender. Equal parts of powdered zinc oxide and starch work well. For foot odor, sprinkle boric acid powder (works great) or baking soda into shoes.