How to remove rust from Nambu cast iron kettle(Tetsubin)

Rust consistently develops, even when utilized by skilled artisans such as ourselves.

This occurrence should not raise significant concern unless the rust is extensive enough to taint the water with a red hue.

To address rust-related concerns, maintenance procedures can be executed by introducing sencha (Green tea) into the affected product and subsequently boiling it.

Kindly refer to the video below for further details.