How can I clean the coffee stain from inside my metal thermos?

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I just took my fully metal thermos out of storage after 5 years and realized it has a coffee stain on the inside of it and I can’t seem to get rid of it. It looks shiny almost like a varethane or something and isn’t thick at all and is even see through. Anyhow thanks for any suggestions before I head out and buy CRL.

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  1. lynn33 says:
    May 30, 2009 at 8:27 am

    Definitely use white vinegar.
    About 1 cup vinegar to 3 cups water
    Soak for 15 minutes, drain, then use a slightly abrasive sponge to get the remaining stain out

  2. Crazy Cat says:
    May 30, 2009 at 8:27 am

    Try white vinegar. Dilute it with water. 1part vinegar and 3 parts water. Let it soak for about 15 minutes. Give it a try. That’s what I use to clean my coffeemaker.

  3. harlysdream66 says:
    May 30, 2009 at 8:27 am

    try coke a cola over nite , it should remove it all then rinse out with warm water

  4. Candy-cane says:
    May 30, 2009 at 8:27 am

    Vinegar… or old fashion elbow grease

  5. brandi says:
    May 30, 2009 at 8:27 am

    Use comet and clean it out then rinse and wash it well :)

  6. shocked says:
    May 30, 2009 at 8:27 am

    HOT water and dishwasher detergent (powder works best), let the paste sit for a few minutes, and then rinse.

  7. Barb M says:
    May 30, 2009 at 8:27 am

    hot water, baking soda and a bottle brush should do the trick. you might want to let the water sit overnight

  8. JESSIEBLUE says:
    May 30, 2009 at 8:27 am

    WHIR VINEGAR AND WATER , RI NCE WELL , RESULT ,A STERILE CLEAN FLASK

  9. sweetpea says:
    May 30, 2009 at 8:27 am

    I always used water and a little bleach in my husband’s thermos. Let it sit, rinse well, allow it to air dry.

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