It often seems a woman's period begins as soon as she's out of the house, without quick access to sanitary products. Even when it's caught, the first flow of menstrual blood can leave a stain on panties that often ends up permanent. This situation is avoidable when the stain is tackled with methods and supplies that lift the stain, rather than making it permanent. Although carrying sanitary products with you is helpful to this situation, the few minutes it takes to get to the bathroom is often enough to leave a stain.
Fill a sink with cold water. Soak the blood-stained panties in the cold water for 10 to 15 minutes. Before removing the panties from the cold water, rub the stain with your fingers to remove as much of the stain as possible. Wring out the underwear to remove excess water.
Lay the panties on a flat surface with the stain facing up. Apply hydrogen peroxide directly to the stain with an eye dropper. Allow the hydrogen peroxide to fizz for two minutes as it loosens the stain. Rinse the stain under cold water, while rubbing it again to loosen more of the stain.
Treat remaining blood stains, if the stain is particularly heavy or large, with a paste made from 1 tbsp. meat tenderizer and 2 tbsp. of water. Mix the paste in a bowl, and then apply it to the remnants of the blood stain. Allow the paste to sit on the stain for 10 minutes, so the enzymes in the meat tenderizer can help break down the proteins in the stain. Rinse the meat tenderizer paste off under cold water.
Launder the panties in the washing machine with laundry detergent and oxygen bleach to remove any last trace of blood. Use cold or warm water, even if the panties can be washed in hot water, to avoid setting the stain.
Check the panties before drying them. If any blood stain remains, repeat Steps 2 through 4 to remove it.