The build-up could be from the Burt's Bees. When I use that I have to rinse it out
very well or else I end up with bad build up.
I've been using the "birthday present" Aveda condish for my cowashes and as a leave-in under gel with awesome results. But I know when that runs out I'll have to find a cheaper alternative. I think Suave is at the top of my list to try.
