The effect of microbubble addition on the removal of surfactant (LAS) adsorbed on the skin surface by shower rinsing was examined. First, a rinsing test with four substrates was performed, and it was found that the residual property of the surfactant was significantly affected by the hydrophobicity and unevenness of the washed surface. When the substrates were rinsed with a shower containing microbubbles, the residual amount of the surfactant was decreased in all substrates. Therefore, we can assume that the microbubbles are effective in removing surfactant from a substrate surface during rinsing. The effect of surfactant removal from skin was examined and the result shows that the surfactant adhered on the skin was effectively rinsed with a shower containing microbubbles. It was supposed that the adsorption phenomenon of surfactant to the bubble surface was effective for rinsing.
