Dermalogica Special Cleansing Gel (8.4 oz) by Dermalogica. $24.99. 8.4 ounces. A soap-free cleansing gel with no harsh detergents.. Dermalogica Special Cleansing Gel is a soap-free, foaming gel designed to thoroughly remove impurities without disturbing the skin's natural moisture balance. Anti-inflammatory balm mint and lavender extracts soothe the skin, while natural quillaja saponaria gently foams away toxins and deep cleans debris.