Renee,
Since your bio beads were dried out, any Nitrosomonas or Nitrobacter bacteria would be dead already, however, If I were going to clean them, I would use hot water followed by soaking in hydrogen peroxide, raher than chlorine bleach. Any hydrogen peroxide left on them going back into the filter will aid, rather than hinder new bacteria, which require oxygen to survive, and mixing with pond water, hydrogen peroxide will release oxygen. Don't worry about adding new bacteria, your fish will provide that from their gut.