Features- concentrated car glass cleaner than conventional glass water cleaning strong capacity. Efficient, a grain of 3 to 4 liter equals to general water wiper. 2. Convenient to carry- portable, small size like milk film general size. It is convenient to carry and use. 3. Usage- this item is suitable for daily cleaning and care of all kinds of cars. Ideal to clean and decontaminate, reduce the friction between the wiper and the glass. 4.Efficient- a grain of 4 liter equals to general water wiper. 5. Powerful cleaning agent- suitable for clothing besmirch, kitchen range hood besmirch, wood polish, mud etc.. 6. Renovate the wiper rubber- features a lubricating effect on the wiper rubber skin and anti-aging function to maintain flexibility and make more durable. 7. How to use- just open glass bottle cover, find the wiper tank, fill it with water and put into a grain of block concentrated. At last, wait for 10 minutes and then use it normally. You may wait for more 5 to 6 minutes in winter. Note 1. A piece of effervescent tablets can be attenuated with3 to 4L of water. 2. Dissolution need 10-15 minutes, longer in winter and faster in summer. 3. You could attenuate the item with tap water if you use it frenquently, but recommend that finishing it witnin 2 months. Useing purified water to attenuate it if you use infrequently and it can be stored for half a year.