Questions about KOBAYASHI Laundry Detergent for Underwear

Kobayashi Underwear Laundry Detergent is a Japanese lingerie soap designed to help remove stubborn underwear stains, including menstrual blood and discharge marks, through soaking.

Add the recommended amount of detergent to cool or lukewarm water, soak the underwear for around 20 minutes, then rinse thoroughly. For older stains, apply the detergent directly before soaking.

Yes, it can be used as a pre-treatment before machine washing. However, it is designed mainly as a soaking detergent for targeted underwear stain removal.

Yes. The formula contains sodium alkyl sulfonate (SAS), a surfactant designed to help loosen protein-based stains such as menstrual blood.

It is suitable for many everyday underwear fabrics, including cotton, linen, polyester, and synthetic materials. It is not recommended for delicate silk fabrics.

No. It has a light soap scent designed to leave underwear feeling fresh without a strong chemical fragrance.

This product is designed specifically for underwear and targeted stain removal rather than replacing a regular laundry detergent for full clothing loads.

Yes. Kobayashi Underwear Laundry Detergent is made in Japan.

The bottle contains 120ml of liquid lingerie detergent.

It is designed for fabric cleaning, not direct skin application. Always rinse underwear thoroughly after washing, and discontinue use if you experience discomfort from wearing freshly washed items.