You need a measuring cup, tablespoon, funnel, and spray bottle. 8 ounces hydrogen peroxide 3%, 3 tablespoons of baking soda, 1 drop of liquid hand dish washing soap. Mix all ingredients into the spray bottle and use within 20 minutes. You should see the stain lift and disappear within 5-10 minutes. Once the mattress dries, if a baking soda film remains, then simply wipe or vacuum it off.