Infusium 23 uses cones in their products, you may be suffering from build up if you are strictly co-washing...would you be able to post the ingredients for you rleave in?

If it does have cones in that are not water soluble, you may want to find a cone free leave in conditioner.
3a/3b thick coarse WL dark brown hair. CG/Mod CG since: 5/4/05. Current products: Right now my hair is in such a tizzy over this winter weather we are hving that nothing really seems to be working. I need a haircut.