The Etude House Soon Jung ph 5.5 Foam Cleanser is mild and cleanses impurities and the skin with zero irritation. The Etude House Soon Jung ph 5.5 Foam Cleanser is mild and cleanses impurities and the skin with zero irritation. With a hypoallergenic formula and the optimal pH of 5.5 it suits even people with the most sensitive skin. Unlike the whip cleanser which has a fluffier consistency, this is more creamy but still effortlessly lathers into a rich foam. No room for irritation while cleansing.