We went through an extensive material selection process to find the best materials possible for the infusion and presentation of tea. Borosilicate glass was selected for the interior of the Carafe because it is more resistant to absorbing aroma, flavor, and staining than other materials.
However, some flavor and aroma will stick to any surface, even borosilicate glass. We have provided a custom brush to clean the carafe. Our recommendation is to wash with mild dish soap and warm water.