Say goodbye to yellow armpit stains! 1 tsp. Dawn, 3-4 tsp. Hydrogen Peroxide, 2 tbsp. baking soda. Mix together, rub in, and be amazed!: Yellow Stained, 3 4 Tsp, Stained Removal, Mixed Together, Sweat Stained, Baking Sodas, Hydrogen Peroxide, Armpit Stained, Yellow Armpit