Plastic cups are often used, and some stains may remain on the inside. How to remove tea stains from plastic cups?
1. Milk deodorant method
First clean it with detergent, then pour two soups of key fresh milk into the plastic cup, close the lid and shake it so that every corner of the cup is in contact with the milk for about one minute, finally pour out the milk and clean the cup .

2. Orange peel deodorant method
First clean it with detergent, then put the fresh orange peel in it, cover it, and let it rinse for about 3 to 4 hours.

3. Use toothpaste to remove tea rust
It is not difficult to remove the tea rust. You only need to pour the water in the teapot and cup, squeeze a piece of toothpaste with an old toothbrush, and rub it back and forth in the teapot and cup. Because the toothpaste contains both detergent and Very fine friction agent, it is easy to wipe off the tea rust without damaging the cup. After rubbing it, rinse it with clean water, and the teapot and cup will become bright as new again.

4. Replace plastic cups
If none of the above methods can remove the peculiar smell of the plastic cup, and if the hot water is poured into the cup, the cup emits a strong pungent odor, then consider not using this cup for drinking. Maybe the plastic material of the cup is not good. Drinking water with it might be OK If it is harmful to your health, it is safer to give it up and replace it with another cup.