Now before you jump in & say clean them, I've tried everything! It's on the inside & outside of the teats. Kind of greasy feeling, slightly milky looking film. Thinking it might be milk fat or proteins (i feed EBM) as the teats that I use for formula don't have the problem.
I even bought all new teats last month thinking they were just old, but its come back on the new teats!
Normally I scrub teats in hot soapy water with a brush, then sterilise. Sometimes I also use a dishcloth to really get inside. I've also run them through the dishwasher but thats no better.
Is there something else I should try? Do they need soaking in something? Help please!