I cowash only, and I co wash at the same time - and with the same stuff - that I use to DC.
What I usually do, is put straight con in my hair, let it sit for about 15 minutes, rub my scalp good, then mix up my DC stuff, and plop that on top, and let the whole mess sit for as long as I want - usually overnight. The next morning, I rinse everything out - and I have clean AND conditioned hair. I haven't used shampoo in months - can't imagine starting to use it again.