For Best Results in Maintaining Temperature.

Want to keep the contents hot or cold longer? The key is to preheat or pre-cool your thermos vacuum container. It is easy. Fill the container with hot water or cold water. Let it sit for five minutes. Empty and then refill with you chosen beverage or food. Do not use the microwave to heat your vacuum bottle.

Cleaning

First, avoid two of the big mistakes. Don't wash it in the dishwasher. Wash by hand. Wash all parts in warm mild soapy water. Use dishwashing soaps like Dawn or Ivory or any other mild dish soap. Rinse clean before using. Harsh abrasive cleaners and scrubbers can damage or tarnish the finishes and inside of the containers. Over time, they can even change the flavors of the stored foods and beverages.

Second, avoid chlorine or bleach. Why? Chlorine and some other strong stain removers attack the rubber gaskets in your seals and lid. Over time, your thermos vacuum contents will begin to leak.

Stubborn stains like coffee and tea are removable. A couple of teaspoons of baking soda and warm water can be left inside. Let it stand open for one hour before rinsing thoroughly. On stubborn stains, soaking overnight produces excellent results. A bottle brush can be helpful.

Some prefer to use vinegar instead. Instead of baking soda, they mix 1 part white vinegar and 3 parts water. Let it set. The concentration can be stronger if necessary. On all cleaning, make sure to rinse very well with water.

Wash the outside with a soft, damp cloth or sponge and wipe dry. Now use it.

There are some off the shelf cleaning products available, but why not try using a home remedy before using a more expensive method.