Sports bottles and water cups that have been used for a long time, the inner wall is always yellow, and there will be a peculiar smell at the mouth of the cup. The common washing method is difficult to wash, how to wash it? One way is to use toothpaste and toothbrush to brush, but after brushing, there will be a big smell. Now there is another way to teach you.
The yellowish inside of the water cup is only a small amount of minerals attached. We can put the rice into the water cup and add a proper amount of water (not too much, just enough to immerse the rice).
Then cover the lid and shake it vigorously for about three minutes, and you will find that the yellow dirt in the cup is gone.
The yellow stain on the mouth of the water glass is actually Staphylococcus aureus, which emits a big peculiar smell, not only unpleasant, but also harmful to health.
We can use a one-to-one ratio of concentrated salt water for soaking, or use white vinegar or alcohol. Because concentrated salt water has no taste, it is better to use concentrated salt water.
Soak for at least one hour, and you will find that the odor has been removed at some point.
Now the whole cup has been washed clean, although the years still leave traces, but germs can't hurt you through the cup.