Other Great Tips!
How to Use Egg Shells to Clean Your Thermos
Cleaning any thermos or water bottle with a narrow neck can be tricky. Use this simple trick using used egg shells.
Rinse well with hot water, then add some crushed egg shells. Fill about 1/2 of the bottle or themos with warm water and shake well.
The broken egg shells will help get rid of any build up you can’t reach otherwise.
Rinse well before using again.