Chemical "neutralization reaction" is the reaction between salt and alkali (theophylline is the main component of tea stains), which turns theophylline into soluble sodium salt and then washes it off with water.

Required materials: salt, white vinegar, baking soda, detergent, toothpaste.

1, salt washing. Generally, if there are tea stains in the cup, you can choose to clean it with edible salt. First, iron the cup with boiling water.

2, put the right amount of salt water, with a brush a few times can be taken out.

3. Clean with toothpaste, squeeze the toothpaste on the toothbrush, and scrub the stained cup with the toothbrush.

4. Wash with baking soda. Tea stains can be easily and quickly cleaned with baking soda.

5. Wash with white vinegar. Generally speaking, white vinegar is an acidic substance, which can neutralize tea stains and remove them well.

6. Wash with detergent. Generally, a teapot and teacup will produce a lot of tea stains when used for a long time. You can choose to clean them with detergent.