How to remove water stains on glass?

1, white vinegar, you can add some white vinegar when cleaning the cup, it can dissolve water stains, and it is transparent, will not leave traces, and is harmless to the human body.

2, add salt to the water, salt can also dissolve water stains, can be recycled to clean, so it will be cleaner.

3, clean with toothpaste, toothpaste directly on the cup, and then clean with a rag.