I think the dishwasher option sounds really harsh. I'd honestly try with a proper bio powder, full strength, even add some vanish just to get them really lovely and bright and then rinse, rinse, rinse until no bubbles then put them out in the sun, you'll be surprised how clean they come up. If that fails I'd move onto the dishwasher one! Aplix as Lyndsay said a pin, or a fine comb to get the bits out!
I think you only started quite late with Erin? That is excellent as you'll be able to get lots of gorgeous NB fluff