Hi,
I am having to supplement Breast milk with some formula, I've been using Tommee Tippee bottles and washing the bottle and cap with a brush, but the nipple part with a cloth. My Mum has just come to stay and has cleaned a mountain of bottles from over night ( 4 bottles per feed... Twins feeding with expressed Breast milk and then formula = a zillion bottles a night) but she separated all the nipples from the White plastic rim that screws onto the bottles! We haven't ever done this before, in fact we didn't even know it was possible.
Do you separate the nipple from the White bit?