noun
bath additive; bath salts; bathing powder
General term for products added to bathwater, such as bath salts, powders, liquids, or tablets, for fragrance, skin care, or relaxation.
疲れた日は、いい香りの入浴剤を入れてお風呂に入ります。
On tired days, I put in a nice-smelling bath additive and take a bath.
This bath additive makes your skin smooth.