The preparation method of glass cleaning water is as follows:

Preparation materials: a bag of salt, a bag of baking soda, a bottle of dish soap and a bottle of white vinegar.

1. Pour in appropriate amount of white vinegar.

2. Pour in an appropriate amount of baking soda. The ratio of baking soda and dish soap is 1:1.

3. Pour in appropriate amount of salt.

4. Squeeze in a few drops of dish soap. The dish soap can remove oil and dirt on the glass.

5. Use chopsticks to stir evenly.