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. ★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. ★Powerful cleaning agent- suitable for clothing besmirch, kitchen range hood besmirch, wood polish, mud etc.. ★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 6 minutes and then use it normally. You may wait for more 5 to 6 minutes in winter