Rinse, let air dry, crush up so they will fit in the hopper and put them in. Sometimes I don't get around to rinsing even. They don't care, and since they dry in a day, I don't have to store them long.
Sheesh! I seem to be over-thinking this too. I let them dry in a large baggie then put them in the food processor until they are chopped into pinhead-size pieces. By the time I'm done they don't look like eggs for sure.
Do the girls eat big chunks of shell?