Is it bad if I never wash or rinse my tea tumbler?!

Question: Is it bad if I never wash or rinse my tea tumbler?
I recently purchased a Starbucks tumbler that is made up of 21% post consumer recycled content and is BPA free. I use it everyday for tea. Green tea, camomile tea, and chai tea mostly. I never rinse it or wash it because I love the way the tea that was once in the tumbler makes the new tea taste. Also, I have the tea plain, no sugar, milk, honey, lemon ect. So, it's basically water and leaves in my tumbler.


Bacteria can still build up, from your mouth. You should wash it. It will still smell like tea. Use soap.

I think I would be washing it, each to their own though*

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