Kobayashi Sarasaty Lingerie Detergent for menstruation cleanly removes blood and other discharge. Just soak for 20 minutes - there is no need to wash by rubbing. As you simply soak, this won't damage undergarments.

How to use:

Use 10ml of detergent (pour 1 unit of the bottle indication) for every 500 ml of water.  Soak the underwear in for about 20 minutes and then rinse afterwards. Extend the soaking time for better effect or stubborn stains.

Ingredients:

Surfactant (40% sodium alkyl sulfonate (SAS), polyoxylene alkyl ethers, sodium alkyl sulfate), a stabilizer