23. In temperate climates, plain water can be used to wash the windows, but it is recommended to add glass cleaner or, in some cases, to remove wax (see specs). The tank should be no more than two-thirds full so that there is free space in case the water expands when it turns into ice. In areas with cold climates, use a special antifreeze glass cleaner that lowers the freezing point of the liquid. It is usually sold in concentrated or finished form. Mix concentrated antifreeze with water in accordance with the manufacturer's instructions on the package.
Caution: Do not use antifreeze for the cooling system as an additive to increase the frost resistance of the washer fluid.
24. To remove stubborn dirt, pour a strong detergent into the washer fluid reservoir, or wash the windows manually with a special cleaning agent.