Soap-Man Cleaning Supplies
Kitchen

How to Clean Thermos

Keeping your thermos clean isn't just about appearance -- it's about hygiene and performance. Here's how to do it right, with the supplies you probably already have at home.

What You'll Need

  • Soap-Man Lemon Glow Dish Soap
  • Bottle brush
  • Baking soda
  • White vinegar
  • Hot water

Step-by-Step Instructions

  1. 1

    Empty and rinse

    Empty any remaining contents and rinse the thermos with hot water.

  2. 2

    Wash with soapy water

    Fill with hot soapy water and scrub with a bottle brush. Reach the bottom and all interior surfaces.

  3. 3

    Clean the lid

    Disassemble the lid and wash all parts. Use a small brush to clean the gasket groove and threaded areas.

  4. 4

    Deodorize stubborn smells

    Fill with hot water, 2 tablespoons baking soda, and 1 cup vinegar. Let fizz for 30 minutes, then rinse.

  5. 5

    Air dry upside down

    Air dry upside down with the lid off so moisture evaporates completely.

Pro Tips

  • TIPHand wash only -- most thermoses are not dishwasher safe due to vacuum insulation.
  • TIPNever store a thermos sealed while wet -- moisture trapped inside breeds bacteria.
  • TIPClean immediately after each use to prevent bacterial growth and lingering smells.

Common Mistakes to Avoid

  • XPutting a thermos in the dishwasher, which can damage the vacuum insulation.
  • XStoring sealed while damp, which breeds bacteria and creates odors.
  • XUsing bleach, which can damage stainless steel finishes and leave residues.

Frequently Asked Questions

Most thermoses are not dishwasher safe due to vacuum insulation. Check your manual.