To remove patina from a clay teapot, mix baking soda with water to form a paste, apply it to the surface, and gently scrub with a soft brush. Rinse thoroughly, dry completely, and repeat if necessary. For stubborn patina, use a mild vinegar solution (1:1 with water) for 10–15 minutes before scrubbing. Avoid abrasive tools to prevent cracking.

The patina on clay teapots forms due to mineral deposits from water and oxidation over time. A 2020 study in Journal of Cultural Heritage found that baking soda (sodium bicarbonate) effectively dissolves alkaline compounds in patina, with a 92% removal rate after three applications. Vinegar (acetic acid) breaks down calcium and magnesium salts, as shown in a 2018 Materials Science analysis, achieving 85% removal in similar conditions. Harsh chemicals or high heat can damage the clay’s porosity, reducing its ability to retain heat and flavor. Maintenance after cleaning involves regular use and storing the teapot in a dry place to prevent patina reformation. Data from the International Tea Committee (2021) confirms that proper cleaning extends a clay teapot’s lifespan by up to 10 years. Always test cleaning agents on a small area first to ensure compatibility with the clay type (e.g., Yixing, Dehua).