I wash it out every day and use a bottle brush. I also have a pipe cleaner brush for down the straw. I don’t bother with bottles with pop out straws and fiddly bits as it’s just extra places for mould
I just wash daily and have never had any mold issues. Kind of defeats the purpose of reusable bottles if you're replacing them that frequently.
Bottle brush, straw brush, sterilise them in Milton once a week. Still end up replacing them every few months!
We use tum tum cups and wash each day x
It helps to have a bottle that is just for water. Using the same water bottle for milk or juice just invites bacteria.
Just wash it. There’s bottle brushes and straw cleaners. We buy A new one when it’s trashed or too small for what they need
We wash it maybe once or twice a week.
I’ve stopped using straw cups/bottles, I used bottle brushes, straw brushes, everything imaginable, and they still got mouldy 😖
Milton