How to Clean a Thermos Food Jar

Why Thermos Food Jars Need Special Cleaning

Thermos food jars keep soups, stews, and rice warm for hours — but food residue left inside quickly develops odors and bacteria. The wide mouth makes cleaning easier than a drink thermos, but the vacuum-insulated walls and lid still require proper care.

What You'll Need

• Dawn Platinum Dish Soap
• Bottle brush with long handle
• Cup lid gap cleaning brush set
• Bottle Bright cleaning tablets
• Baking soda
• White vinegar

Daily Cleaning After Every Use

1. Empty and rinse immediately after use — don't let food sit and dry inside
2. Disassemble the lid completely — remove the inner lid, gasket, and any other parts
3. Wash the jar with warm soapy water using a bottle brush
4. Scrub all lid parts with a lid gap brush, paying attention to threads and gasket grooves
5. Rinse all parts thoroughly
6. Air dry with the lid off and all parts separated

Deep Cleaning: Bottle Bright Method

1. Fill the jar with warm water and drop in one Bottle Bright tablet
2. Soak lid parts in a separate bowl with another tablet
3. Let soak 20–30 minutes, then rinse thoroughly

Removing Food Stains and Odors

For stubborn food stains, add 2 tablespoons of baking soda and warm water, scrub with a bottle brush, and let soak 30 minutes. For odors, a white vinegar soak for 30 minutes followed by a dish soap wash works well.

What to Avoid

• Dishwasher — damages vacuum insulation and warps lids
• Bleach — damages stainless steel
• Soaking the exterior — can affect the finish

Final Thoughts

Rinse immediately after every use, disassemble the lid fully, and use a bottle brush for the jar and a gap brush for the lid. A weekly Bottle Bright soak keeps it fresh and stain-free.