Let us help you take care of period stains in 3 simple steps.
Soak. Fill a tub with cold water and fully immerse the clothing in it. If the stains are fresh, then 10 minutes is enough. If they are dried up, soak your shorts overnight.
Wash. For whites, use hydrogen peroxide. Apply it over the stain and clean it. For coloured shorts, pour a solution of 1 spoon of bleach and 1 cup of water over the stain. Then add some salt and scrub the stain with a brush.
Finally. Wash the garment with your hands and hang it to dry. Avoid putting it in the washing machine.