8 ounces/237 ml hydrogen peroxide 3% 3 tablespoons/14.29 grams of baking soda 1 drop of liquid hand dish washing soap Mix all ingredients in a spray bottle and use within 20 minutes. Do not attempt to store the leftover solution. because it will leak out of the bottle. Stain should lift and disappear in 5-10 min. Once mattress is dry, vacuum any baking soda that may remain.