fwiw, i always had alot of blackheads and was a crazy Sugar eater as a kid... As I got older I noticed that if I ate alot of Sugar my sweat would be greasy and I would get a heavy earwax buildup.. if I avoided Sugar I wouldnt get either problem... since ive kicked my sugar addiction my face has cleared up alot.. however I wouldnt mind learning about an iodine-based cleanser...