Cleaning windshield

• Take about a half-pint of gasoline and dissolve in it all the paraffin that it will take up; i.e. make a saturated solution of paraffin in gasoline. The paraffin is not very soluble but little need be used. Cut it into very fine shavings with a knife and let it stand in the gasoline for several hours, stirring occasionally to facilitate solution. After the solution is made it may be bottled and rubbed lightly upon the glass as often as is found necessary. A shield covered with this solution will on the evaporation of the gasoline, be coated with a very thin layer of paraffin which will in no way interfere with the transparency, but will keep from clouding in either damp or cold weather. 

• Rub a half-and-half mixture of kerosene and glycerin on the clouded surface of the glass. A small bottle of this mixture, tightly corked, may be wrapped in a little waste put in a half pound baking powder can and stored away in the toolbox or some other convenient place about the car. When it begins to rain, pour a small portion of the mixture on the waste, rub over the damp surface of the glass, and all water will spread out in a thin sheet, whenever it comes in contact with the glycerin, instead of forming in little globules, which are so detrimental to the vision.

Taken from  The Care of the Car
©1917