This may not be of any use to you, but I've been using sulfate free shampoo that has neem in it to clean my clarisonic. My skin is naturally oily; even when I don't use a cleanser with oil, I turn the brush gray. Did I mention that I don't wear foundation? Lol so far this has been working.
3b/c, medium-coarse, low porosity, high density
HG: Jessicurl Too Shea and Kinky Curly Curling Custard
Shampoo: nonsulfate shampoo and Suave Naturals sulfate shampoo when needed