I have never used soy wax in a shampoo bar in my life. I use classic natural shampoos without sulfates and other chemicals because my hair is thin, and my scalp is very delicate, so I can only use natural shampoo for hair, preferably more expensive. I use wax to remove blackheads. I recently learned this from this article -- Does Waxing Remove Blackheads? | Best Hair Advisor. I used to think that wax was only able to remove hair. Then I came across an interesting article that said that wax can remove both hair and blackheads from the face for a long time.