Good work Anne. I have a frozen starter which I will use in a couple of days time. I am not sure you have to steralize that well. In fact if the starter is good maybe it would overpower any stray baddies. Dr Myahill said she just left a bit of the last batch in and filled the container up again with her medium. The container must get pretty yucky. I also bought some longlife milk which is supposed to negate any need for boiling. I will give that a go.