Tea stains can accumulate on mugs over time due to tannins, leading to unsightly brown marks. Fortunately, there are several simple and natural methods to restore your cups to their original cleanliness. Baking soda serves as a gentle abrasive; mixing it with water creates a paste that effectively scrubs away stains. White vinegar is another powerful option; by combining it with warm water and letting it sit, you can dissolve tough stains. For a more natural approach, using lemon and salt can help lift discoloration, thanks to the citric acid in lemons. If fresh lemons aren't available, bottled lemon juice can also be effective when soaked in warm water. Alternatively, a small amount of plain white toothpaste can be applied with a soft sponge to remove stains. Additionally, a paste made from salt and water can be used for fresh stains. To prevent future stains, it's advisable to wash your cups promptly after use, which helps avoid the buildup of tannins and makes cleaning easier.