Read a thread about rinsing a thermos and clearing out residue and a comment referenced the 3 rinses in chemistry.
All us non-chemistry minded travel mug/bottle/thermos owning folks who’ve struggled with soapy tastes after washing would like to learn.
Thank you.
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https://croplife.org/crop-protection/stewardship/container-management/triple-rinse/
Each time you rinse the bottle some water is left stuck to the walls etc. If you do it once, you leave whatever else in there. If you do it again, you dilute that down to the point where it’s not detectable.
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