a paste of meat tenderizer.Pat into the stain. Do not rub. Keep damp and do not leave on the stain more than 10 minutes. Repeat the cold water treatment. If the stain is sufficiently removed, allow to air dry. (Do not use heat to dry, if there is a remaining stain, you will set it permanently) If the item is light colored, you may try a 10% hydrogen peroxide solution. References :
a paste of meat tenderizer.Pat into the stain. Do not rub. Keep damp and do not leave on the stain more than 10 minutes. Repeat the cold water treatment. If the stain is sufficiently removed, allow to air dry. (Do not use heat to dry, if there is a remaining stain, you will set it permanently) If the item is light colored, you may try a 10% hydrogen peroxide solution.
References :