We do pee only, and I throw them with the regular wash. If we had dirty diapers, we might (maybe maybe) do poo as well and wash with the diapers. Since we don't have diaper loads, pee only.
my single layer fc handwash and dry extremely well. since our washing situation isn't what I'd call ideal (horrible coin operated laundry on premises that leaves clothes stained and costs a lot to operate), I'm pretty much only handwashing them. my aio mamacloth are too thick to air dry in the winter (we'll see next summer) but single layer flannel family cloth do just fine.