How to Remove Tea Stains From Cups, Teapots and Infusers
Tea stains build up quickly on mugs, teapots and infusers, especially with black tea and hard water. The brown film is made of tannins and minerals that cling to surfaces over time. It is not harmful, but it looks unappealing and can affect the flavour of delicate teas. Most stains come off with gentle household methods, although unglazed clay teapots need different care from ceramic and glass.
Why tea stains form
Tannins in tea bind to tiny imperfections in glazes and surfaces, and minerals in hard water help them stick. Leaving tea to dry in a cup or teapot overnight makes stains much harder to remove.
Stains build faster on older mugs with worn or crazed glazes and on stainless steel infusers with fine mesh, where tea particles get trapped.
Use baking soda for ceramic and glass
Make a paste of baking soda and a little water, rub it onto stains with a soft sponge and let it sit for a few minutes before rinsing. Baking soda is mildly abrasive and lifts most tea rings without scratching glazes.
For heavier stains, soak mugs or glass teapots in warm water with a spoonful of baking soda or oxygen-based cleaner for an hour or two, then wash with dish soap and rinse thoroughly. Avoid harsh scouring pads, which dull glass and glazes.
Clean infusers and strainers
Tea leaves and fine particles clog mesh infusers, slowing water flow and trapping stale flavours. Soak infusers in warm water with baking soda or a denture cleaning tablet, then scrub with a small soft brush.
Rinse infusers immediately after every use and tap out leaves while wet. Letting them dry with leaves inside makes cleaning much harder.
Care for clay and cast iron teapots
Unglazed Yixing clay teapots absorb tea flavours and are traditionally seasoned by use. Do not use soap, baking soda or cleaners in them, since the clay can absorb the taste. Rinse with hot water only and allow to dry open.
Cast iron teapots with enamel interiors can be washed gently with warm water, but avoid abrasive cleaners that damage the enamel. Always dry cast iron thoroughly to prevent rust on exposed areas.
Prevent future stains
Rinse cups and teapots soon after use, and dry them well. Using filtered or softer water reduces mineral buildup and staining at the same time.
Clean teaware regularly rather than waiting for heavy staining. Dedicated teapots for different tea types, such as one for green teas and one for smoky black teas, also help preserve flavours.