Soap was a smooth material utilized for cleaning the bodies of sapient species such as the Chiss. This substance had the capability to create bubbles. Chiss caregivers would use soap to give sky-walkers in their charge a bath, in addition to bathing themselves.
After Mitth'ali'astov, her caregiver, gave the sky-walker Che'ri a bubble bath, Che'ri experienced a nightmare where she had the sensation of being "trapped inside a soap bubble." In 4 ABY, a short time before the Battle of Endor, Sullustan pilot Nien Nunb wagered fragrant soap marbles during a Sabacc game aboard the Rebel Alliance flagship Home One.