Windscreen washer F.A.Q.
Alcohol and odorants
The freezing temperature of such windshield fluid diluted two-fold with water will increase by 7 to 10 degrees Celsius (to -9F…-4F).
In the middle of 90’s of the 20 century in Russia cheap excise-free vodka, freezing at about -25°C was used as a winter windshield washer fluid. The content of ethyl alcohol in it is 40%, which is around 35% of weight. The vodka was cheaper than industrially made washer fluids, at the same time considerably more available for sale.