Mix ½ cup of white household vinegar, 1 pint of rubbing alcohol, and 1 teaspoon of mild dishwashing liquid and pour into a 1-gallon container. Add enough water that the 1-gallon container is full.
Pour this solution into a clearly-labeled spray bottle. Spray on windows and then crumple up newspaper or use paper towels to clean the windows. You can even add a drop or two of blue food coloring!