Summer / Bug Cleaning Mix: Usually requires a small amount of concentrate mixed with a full reservoir of water to cut through bugs, grime, and road film without streaking.Winter / Anti-Freeze Mix: Requires a much higher concentration of the product (or using it entirely undiluted) to prevent your reservoir and wiper fluid lines from freezing in sub-zero temperatures.Mixing Location: It is generally best to mix the concentrate with water in a clean, separate jug before pouring it into your vehicle's windshield washer fluid reservoir.