Thus soap goes deep. I work with a chemical powder that i occasionally have accidents with and it stains my skin bright blue and can take a few days to remove. Cor removes the chemical stains from my kneck and wrists in about 3 to 5 mins. Very good black head remover. My skin is very sensitive and Cor gives me no NO irration, redness or side effects other than my skin is a bit dry after so I use the Cor moisturiser then put my creams or oil on over the top. I only use this soap every other day because it fades my fake tan and my skin looks and feels great.