That's not for cleansing. They use a douche for that, if they do it that is. And a douche bag wouldn't have cream in it.
What you saw, if it was a "cream" in a tube injected straight into the pussy, was probably medication for bacterial vaginosis. Not an STI, but it causes a big stink from their pussies if left unchecked. Makes their pussy smell like rotten fish, bro.