How to remove water stains on cups. Tips on how to remove water stains on cups.

1. Vinegar can effectively remove scale or tea scale in cups. The main component of scale is calcium carbonate. Through chemical reaction, vinegar contains acetic acid, which can react with calcium carbonate to form water-soluble salt, so scale can be washed away.

2. Use salt to wipe away the scale or tea scale on the glass. If there is dirt on the glass or glass pot, if you soak it in salt water for 10 minutes and then dry it with salt, it will be clean quickly.

3. Potatoes can remove scale or tea scale on the glass. I bought potatoes at home, peeled the potatoes, and boiled the potato skins in a pot. After boiling the water, use the boiling potato slices water to clean the surface of the tea cup. This can remove the scale or tea scale on the glass.

4. Toothpaste can also quickly remove scale or tea scale. Squeeze out the toothpaste and spread evenly on the inside surface of the glass. Use a steel wool ball, toothbrush or rag to clean the tea-stained surface by applying it repeatedly. After scrubbing for three minutes, you will find that the toothpaste changes color, which means that the scale or tea scale has been removed, and then rinse with water.