Every insulated cup requires deep cleaning after a certain time.
Mix the vinegar and baking soda inside the mug.
Let them settle down the mixture foam.
Shake the mixture after replacing the lid on the cup.
Pour the solution out and rinse the cup and lid underwater.
Remove the detachable parts of the lid and rubber seal.
Use dishwashing solution in the water and soak all components for a few minutes.
Rinse the lid to wash off soap residue.
Let the cup and lid dry.