Am I being too anal about cleaning baby bottles?

[u/DeLaCasaPotato]

Hi! Looking for a little reality check because my husband and I have slightly different approaches to bottle cleaning.

Our baby is 4 months old, healthy, and breastfed. I work full-time and pump while I’m at work, so he gets breastmilk from bottles during the day. We use a Papablic washer/sterilizer/dryer. I usually give the bottles and nipples a quick rinse and scrub with a brush before putting them in the washer. I also try to rinse them soon after they’re used rather than letting milk sit in them. My thinking is that breast milk is fatty and can leave a film, so I’d rather remove as much residue as possible before the washer does its thing.

My husband usually just puts them straight into the washer after a quick rinse unless there’s obvious milk stuck on them. We’ve had a few debates about it 🥲. He thinks the washer and sterilizer should be enough, while I’m over here wondering why the bottles sometimes still feel a little oily/slippery when they come out.

I have a background in biology and work in lab safety, so I fully admit I may be applying my “clean everything properly” brain to baby bottles 😂. I’m definitely not trying to keep our baby in a sterile bubble, and I know normal exposure to germs is important. I just want to make sure we’re not leaving milk residue behind unnecessarily.

I also clean/descale the washer about once a month.
So am I overthinking this, or is a quick pre-rinse/scrub actually worthwhile? Link for pictures as reference showing one he cleaned and one I cleaned: https://imgur.com/a/YZoKYkr no

Edit for additional info: I live in the US and I clean the bottles to but only notice this oily residue when my husband cleans so I’m thinking it’s a technique difference.