For a fast and easy way to make your own glass cleaner and save $$ on pricey store-bought brands, just combine 1/2 cup of rubbing alcohol, 1 teaspoon of liquid dish soap, and 2 cups of water in a spray bottle. Spray on, wait a couple of minutes, then wipe. The soap will lift the dirt while the alcohol erases any residue, and best of all, no streaks!