When adding fluid to the washer reservoir, wipe the windshield as described below. It is recommended to do this at least once every two weeks.
Figure 337. Windshield washer reservoir location
In order for the product to dissolve better in water, you should first pour it into the tank, and then water. The location of the washer reservoir is shown in the figure 337. In cold weather, antifreeze should be used.
Note: If the glass surface cleaned with brushes remains covered with a greasy film despite the addition of shampoo, the glass must be thoroughly cleaned. To do this, apply the product to the glass and wipe it with newspaper, applying light pressure. Then the film will be removed. Faux leather cloth or napkins are too soft for this. Experience shows that the best effect is achieved by using conventional glass cleaning products.
(Material taken from a web resource: mercedesman.ru)
