My little ones sippy cup smells mouldy. I clean it daily with hot water and soap as well as sterilise it but to no avail.. help!
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Vinegar kills mould I'd scrub with that.
I switched to the thermos funtainer bottles as they're so easy to clean and no mould yet !

Do you use a straw cleaner?

I was just googling how to clean these last night. It did say separate the parts by pulling the sinker end and clean with straw cleaner but my current straw cleaner is too thick to get into the straw

You need to take all the bits apart and clean them carefully including inside the straw. B. Box sells the replacement straw pack with straw cleaner (available in Chemist Warehouse, Woolies) but you should be able to buy straw cleaners elsewhere too.
I do! and I pull everything apart too 😩
I do all this! ðŸ«

Interesting, I haven't had an issue like this and I've used this cup with both of my children. What products are you using? How do you sterilise it? Do you let the cup dry completely after cleaning? If there is some moisture left behind perhaps that's causing some microbial growth.