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number one rule is get stainless steel shit. stainless steel water bottle stainless steel straw, you dont want that rubber plastic etc shit it grows mold like a mf. turns out that was the main culprit of what happened to me, my reusable water bottle was plastic and it didn't matter how much i let it soak or cleaned it out.

get this either if you can or can't afford the stainless steel stuff and just be really on cleaning it; staw cleaner looks like this:

and get one its mammas the bottle cleaner for your cup:

You put that tablet in the bottle, add hot water, let it fizz and soak for a bit and hey presto, any stains or discolouration or weird little crevices are suddenly removed of their hidden nasty bits.

My niece kept saying her water bottle tasted weird, and she washed it and washed it, and then me and my mum were like GIVE IT HERE and we put a denture tablet in it and added the straw to it and it started fizzing up the straw and all this black gunk started coming out the weird curvy bits of the fitted straw like a Coke-mentos experiment.

It’ll taste slightly minty unless you rinse rinse rinse rinse rinse rinse but that’s not a terrible thing, and let’s face it, denture tablets are for cleaning dentures so, you know, designed to clean things that go in mouths.