What ti put in body wash that makes evil girls skin gross or dry?

So, my friend is at the beach with an evil %26#039;friend%26#039; that we both hate. All she does is insult us and make fun of us. And we were thinking about putting something in her body wash to make her skin gross. Oily and pimply is good. Or really really dry. Either one. Any ideas as to what to put in it?|||You could put a lot of rubbing alchohol in it, to make it really dry. Or vegetable oil in it to make it greasy.