How does one go about cleaning coffee stains off the silicone gaskets in the Thermos 16 ounce King tumbler?
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Use baking soda, Barkeepers Friend or a Magic Eraser
When ours get yucky, I soak them overnight with one part vinegar, 3 parts hot water, and a few drops of Simple Dawn dish soap.
It usually gets them very clean.
I try not to rub or scrub them since they tend to get wonky if I do.
Hope this helps!
I'd soak it in equal parts water and vinegar for 20 minutes, then try scrubbing it
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