Thank you, great info. Hopefully I won't have a problem with buildup. So far if a product has given me problems it usually is a dull film, which is what Deva products did. I can shampoo with either Kinky Curly Come Clean or AO Honeysuckle Rose shampoo and I'm good. And if I rotate between several different co washes, I don't have the dull film issue. So I'm always looking for another good co wash product.