If your Stanley thermos is looking a little grubby, there is no need to be alarmed. All you need is some hot water and a little soap. Here’s how to do it:

  1. Fill a pot with enough hot water to cover the thermos.
  2. Add soap and stir until the soap has dissolved.
  3. Pour the hot water into the thermos and let it soak for 10 minutes.
  4. Remove the lid of the thermos and use a spoon to clean any dirt or residue on the inside walls of the container. Be sure to get into all of the nooks and crannies!
  5. Rinse off the thermos with cold water, then dry it off completely before storing it away again ..